Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - Fair value, measurements, recurring - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 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
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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	53	12
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings	8	15
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in other comprehensive income (loss)	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, purchases	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, sales	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, issuances	0	1
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, settlements	0	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value, ending balance	61	28
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in earnings	5	15
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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	9	7
Fair value, measurement, recurring, asset, gain (loss) included in earnings	1	4
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0
Fair value, measurement, recurring, asset, purchases	0	0
Fair value, measurement, recurring, asset, sales	(9)	0
Fair value, measurement, recurring, asset, issuances	0	0
Fair value, measurement, recurring, asset, settlements	0	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, measurement, recurring, asset value, ending balance	1	11
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	4
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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	9	7
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0
Fair value, measurement, recurring, asset, purchases	2	0
Fair value, measurement, recurring, asset, sales	0	0
Fair value, measurement, recurring, asset, issuances	0	0
Fair value, measurement, recurring, asset, settlements	0	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, measurement, recurring, asset value, ending balance	11	7
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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	91
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	28
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0
Fair value, measurement, recurring, asset, purchases	0	1,039
Fair value, measurement, recurring, asset, sales	0	(1,012)
Fair value, measurement, recurring, asset, issuances	0	0
Fair value, measurement, recurring, asset, settlements	0	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, measurement, recurring, asset value, ending balance	0	146
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	0	1
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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
Fair value, measurement, recurring, asset, gain (loss) included in earnings	(1)	2
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0
Fair value, measurement, recurring, asset, purchases	4	4
Fair value, measurement, recurring, asset, sales	0	0
Fair value, measurement, recurring, asset, issuances	0	0
Fair value, measurement, recurring, asset, settlements	(3)	(6)
Fair value, measurement, recurring, asset, transfers into level 3	0	0
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, measurement, recurring, asset value, ending balance	7	8
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	(1)	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	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
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, liabilities measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	$ 0	$ 0