Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - Fair value, measurements, recurring - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative liabilities, net of derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into level 3	$ 0	$ 0	$ 0	$ 0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value, beginning balance	61	28	53	12
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings	(1)	7	7	22
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, purchases	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, sales	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, issuances	0	2	0	3
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, settlements	(10)	0	(10)	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value, ending balance	50	37	50	37
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in earnings	(1)	10	(4)	25
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	1	11	9	7
Fair value, measurement, recurring, asset, gain (loss) included in earnings	1	0	2	4
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	0	0	0
Fair value, measurement, recurring, asset, sales	0	(2)	(9)	(2)
Fair value, measurement, recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	2	9	2	9
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	0	0	4
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Available-for-sale securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	11	7	9	7
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	0	0	0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	1	0	3	0
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement, recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	12	7	12	7
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	0	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Mortgage loans held-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	0	146	0	91
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	21	0	49
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	812	0	1,851
Fair value, measurement, recurring, asset, sales	0	(882)	0	(1,894)
Fair value, measurement, recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	0	97	0	97
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	1	0	1
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Finance receivables and loans, net | Consumer Loan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	7	8	7	8
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	0	(1)	1
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	4	5	8	8
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement, recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	(4)	(5)	(7)	(9)
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	7	8	7	8
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	0	(1)	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, transfers into level 3	0	0	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	$ 0	$ 0	$ 0	$ 0