Annual report pursuant to Section 13 and 15(d)

PARENT-ONLY FINANCIAL STATEMENTS - Cash Flow Statement (Details)

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PARENT-ONLY FINANCIAL STATEMENTS - Cash Flow Statement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities      
Net income attributable to Huntington Bancshares Inc $ 1,295 $ 817 $ 1,411
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 391 367 386
Net cash provided by (used in) operating activities 2,062 1,323 1,574
Investing activities      
Sales of available-for-sale securities 5,892 392 3,903
Net cash received from business combination 466 0 0
Net cash provided by (used in) investing activities (3,962) (8,639) (1,877)
Financing activities      
Net proceeds from issuance of medium-term notes (1,245) (2,373) 586
Payment of long-term debt (3,404) (3,052) (743)
Repurchases of common stock (650) (92) (441)
Net proceeds from issuance of preferred stock 486 988 0
Payment to repurchase preferred stock (700) 0 0
Other, net (48) (19) (24)
Net cash provided by (used for) financing activities 827 12,741 (1,199)
Increase (decrease) in cash and cash equivalents (1,073) 5,425 (1,502)
Cash and cash equivalents at beginning of period 6,595 1,170 2,672
Cash and cash equivalents at end of period 5,522 6,595 1,170
Supplemental Cash Flow Information [Abstract]      
Interest paid 185 453 989
Parent Company      
Operating activities      
Net income attributable to Huntington Bancshares Inc 1,295 817 1,411
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed net income of subsidiaries (118) 553 (942)
Depreciation and amortization 23 0 (2)
Other, net (217) 89 (19)
Net cash provided by (used in) operating activities 983 1,459 448
Investing activities      
Repayments from subsidiaries 8 8 701
Advances to subsidiaries (59) (256) (11)
Sales of available-for-sale securities (28) (1) (38)
Net cash received from business combination 248 0 0
Net cash provided by (used in) investing activities 169 (249) 652
Financing activities      
Net proceeds from issuance of medium-term notes 513 747 797
Payment of long-term debt (1,508) (800) 0
Net proceeds from issuance of long-term borrowings (888) (698) (671)
Repurchases of common stock (650) (92) (441)
Net proceeds from issuance of preferred stock 486 988 0
Payment to repurchase preferred stock (700) 0 0
Other, net (39) (8) (18)
Net cash provided by (used for) financing activities (2,786) 137 (333)
Increase (decrease) in cash and cash equivalents (1,634) 1,347 767
Cash and cash equivalents at beginning of period 4,466 3,119 2,352
Cash and cash equivalents at end of period 2,832 4,466 3,119
Supplemental Cash Flow Information [Abstract]      
Interest paid $ 71 $ 113 $ 135