Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - Fair value, measurements, recurring - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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	(2)	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	12	(2)
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings	35	(10)
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	5	24
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, settlements	(1)	0
Fair value, measurement, recurring, asset, transfers into level 3	0	0
Fair value, measurement, recurring, transfers out of level 3	2	0
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value, ending balance	53	12
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in earnings	26	(10)
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	7	8
Fair value, measurement, recurring, asset, gain (loss) included in earnings	4	(1)
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	(3)	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	1	0
Fair value, measurement, recurring, transfers out of level 3	0	0
Fair value, measurement, recurring, asset value, ending balance	9	7
Fair value, assets, recurring, net unrealized gains (losses) included in earnings	4	(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	1	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	7	2
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	5
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	9	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	91	30
Fair value, measurement, recurring, asset, gain (loss) included in earnings	64	67
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0
Fair value, measurement, recurring, asset, purchases	2,640	2,734
Fair value, measurement, recurring, asset, sales	(2,693)	(2,740)
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	(102)	0
Fair value, measurement, recurring, asset value, ending balance	0	91
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	102	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	8	11
Fair value, measurement, recurring, asset, gain (loss) included in earnings	2	4
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0
Fair value, measurement, recurring, asset, purchases	14	18
Fair value, measurement, recurring, asset, sales	0	0
Fair value, measurement, recurring, asset, issuances	0	0
Fair value, measurement, recurring, asset, settlements	(17)	(25)
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	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
Interests retained in financial asset sales
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	0	2
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	0	0
Fair value, measurement, recurring, asset, sales	0	0
Fair value, measurement, recurring, asset, issuances	0	0
Fair value, measurement, recurring, asset, settlements	0	(2)
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	0
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