Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance, beginning of period       $ 12,314 $ 11,668 $ 11,795 $ 11,102
Other comprehensive income before reclassifications       (40) 91 492 415
Amounts reclassified from accumulated OCI to earnings       7 7 21 19
Period change       (33) 98 513 434
Balance, end of period $ 12,917 $ 12,314 $ 11,909 12,917 11,909 12,917 11,909
Unrealized gains and (losses) on debt securities | Debt Securities              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance, beginning of period       207 (83) (28) (363)
Other comprehensive income before reclassifications       0 63 213 333
Amounts reclassified from accumulated OCI to earnings       5 6 27 16
Period change       5 69 240 349
Balance, end of period 212 207 (14) 212 (14) 212 (14)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] | Equity securities              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance, beginning of period       342 54    
Other comprehensive income before reclassifications       (40) 28 279 82
Amounts reclassified from accumulated OCI to earnings       0 0 0 0
Period change       (40) 28 279 82
Balance, end of period 302 342 82 302 82 302 82
Unrealized gains and (losses) on cash flow hedging derivatives              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance, beginning of period           23 0
Unrealized gains (losses) for pension and other post- retirement obligations (2)              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance, beginning of period       (259) (244) (251) (246)
Other comprehensive income before reclassifications       0 0 0 0
Amounts reclassified from accumulated OCI to earnings       2 1 (6) 3
Period change       2 1 (6) 3
Balance, end of period (257) (259) (243) (257) (243) (257) (243)
Accumulated Other Comprehensive Loss              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance, beginning of period       290 (273) (256) (609)
Balance, end of period 257 290 (175) $ 257 $ (175) $ 257 $ (175)
Reclassification out of Accumulated Other Comprehensive Income              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Net unrealized loss on securities transfer $ (74) $ (81) $ (126)