Annual report pursuant to Section 13 and 15(d)

PARENT COMPANY FINANCIAL STATEMENTS - Cash Flow Statement (Details)

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PARENT COMPANY FINANCIAL STATEMENTS - Cash Flow Statement (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]                      
Interest paid                 $ 989 $ 742 $ 409
Operating activities                      
Net income $ 317 $ 372 $ 364 $ 358 $ 334 $ 378 $ 355 $ 326 1,411 1,393 1,186
Adjustments to reconcile net income to net cash provided by operating activities:                      
Depreciation and amortization                 386 493 413
Net cash provided by (used in) operating activities                 1,574 1,726 1,954
Investing activities                      
Sales of available-for-sale securities                 3,903 1,419 2,490
Cash paid for acquisitions, net of cash received                 0 (15) 0
Payments for (Proceeds from) Other Investing Activities                 (228) (102) (18)
Net cash provided by (used in) investing activities                 (1,877) (3,663) (4,866)
Financing activities                      
Decrease in short-term borrowings                 1,796 2,229 1,891
Repayments of Long-term Debt                 743 2,798 948
Net proceeds from issuance of medium-term notes                 586 (3,025) 1,371
Net proceeds from issuance of preferred stock                 0 495 0
Repurchases of common stock                 (441) (939) (260)
Other, net                 (2) (5) (11)
Net cash provided by (used for) financing activities                 (1,199) 3,089 3,047
Parent Company                      
Condensed Cash Flow Statements, Captions [Line Items]                      
Interest paid                 135 126 90
Operating activities                      
Net income                 1,411 1,393 1,186
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed net income of subsidiaries                 (942) 197 (997)
Depreciation and amortization                 (2) (2) 4
Other, net                 (19) 121 (37)
Net cash provided by (used in) operating activities                 448 1,709 156
Investing activities                      
Repayments from subsidiaries                 701 21 442
Advances to subsidiaries                 (11) (13) (29)
Sales of available-for-sale securities                 (38) 0 1
Cash paid for acquisitions, net of cash received                 0 (15) 0
Net cash provided by (used in) investing activities                 652 (7) 414
Financing activities                      
Repayments of Short-term Debt                 0 (400) 0
Net proceeds from issuance of medium-term notes                 797 501 0
Net proceeds from issuance of long-term borrowings                 (671) (584) (425)
Net proceeds from issuance of preferred stock                 0 495 0
Repurchases of common stock                 (441) (939) (260)
Other, net                 18 41 20
Net cash provided by (used for) financing activities                 (333) (968) (705)
Increase (decrease) in cash and cash equivalents                 767 734 (135)
Cash and cash equivalents at beginning of period       $ 2,352       $ 1,618 2,352 1,618 1,753
Cash and cash equivalents at end of period $ 3,119       $ 2,352       $ 3,119 $ 2,352 $ 1,618