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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 622 $ 146
Other comprehensive income (loss), net of tax:    
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax (628) 405
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax (10) 377
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 3 6
Total other comprehensive income (loss), net of tax (635) 788
Comprehensive income (loss) (13) 934
Less: Comprehensive income attributable to noncontrolling interests 0 0
Comprehensive income (loss) attributable to Key $ (13) $ 934