Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Balance, beginning of period	$ 1,065,000,000	$ 669,000,000	$ 1,023,000,000
Included in earnings	97,000,000	(74,000,000)	(393,000,000)
Purchases/originations	449,000,000	601,000,000	232,000,000
Settlements	52,000,000	(180,000,000)	(242,000,000)
Transfers into Level 3	10,000,000	49,000,000	49,000,000
Balance, end of period	1,673,000,000	1,065,000,000	669,000,000
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to instruments still held	215,000,000	5,000,000	(269,000,000)
Derivative assets	3,173,000,000	2,908,000,000
Derivative liabilities	3,952,000,000	2,013,000,000
Unrealized gains or losses included in other comprehensive income for instruments still held	0	0	0
Interest Rate Contract | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Derivative assets	7,000,000	12,000,000	61,000,000
Derivative liabilities	8,000,000	8,000,000	8,000,000
Residential Mortgage Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Balance, beginning of period	154,000,000	161,000,000	183,000,000
Included in earnings	(18,000,000)	(2,000,000)	3,000,000
Purchases/originations	0	0	0
Settlements	(23,000,000)	(54,000,000)	(74,000,000)
Transfers into Level 3	10,000,000	49,000,000	49,000,000
Balance, end of period	123,000,000	154,000,000	161,000,000
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to instruments still held	(18,000,000)	(2,000,000)	3,000,000
Servicing Rights
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Balance, beginning of period	1,121,000,000	656,000,000	993,000,000
Included in earnings	177,000,000	(139,000,000)	(565,000,000)
Purchases/originations	448,000,000	604,000,000	228,000,000
Settlements	0	0	0
Transfers into Level 3	0	0	0
Balance, end of period	1,746,000,000	1,121,000,000	656,000,000
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to instruments still held	311,000,000	78,000,000	(227,000,000)
Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Balance, beginning of period	4,000,000	53,000,000	10,000,000
Included in earnings	22,000,000	153,000,000	272,000,000
Purchases/originations	1,000,000	(3,000,000)	4,000,000
Settlements	(28,000,000)	(199,000,000)	(233,000,000)
Transfers into Level 3	0	0	0
Balance, end of period	(1,000,000)	4,000,000	53,000,000
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to instruments still held	6,000,000	15,000,000	58,000,000
Equity Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Balance, beginning of period	(214,000,000)	(201,000,000)	(163,000,000)
Included in earnings	(84,000,000)	(86,000,000)	(103,000,000)
Purchases/originations	0	0	0
Settlements	103,000,000	73,000,000	65,000,000
Transfers into Level 3	0	0	0
Balance, end of period	(195,000,000)	(214,000,000)	(201,000,000)
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to instruments still held	$ (84,000,000)	$ (86,000,000)	$ (103,000,000)