Fair Value Disclosures - Rollforward of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Trading Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ 0	$ 3
Included in earnings	0	0	0
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	0	0	23
Issuances	0	0	0
Sales	0	0	(26)
Settlements	0	0	0
Transfers into Level 3			0
Transfers out of level 3 and other		0
Other	0		0
Ending balance	0	0	0
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	0
Non-agency MBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	368	391
Included in earnings	0	306	13
Included in unrealized net holding gains (losses) in OCI	0	(178)	4
Purchases	0	0	0
Issuances	0	0	0
Sales	0	(481)	0
Settlements	0	(15)	(40)
Transfers into Level 3			0
Transfers out of level 3 and other		0
Other	0		0
Ending balance	0	0	368
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	0
Loans and Leases
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0	0
Included in earnings	(1)	0	0
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	0	0	0
Issuances	0	0	0
Sales	0	0	0
Settlements	0	0	0
Transfers into Level 3			0
Transfers out of level 3 and other		0
Other	24		0
Ending balance	23	0	0
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	(1)
MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,023	2,618	1,108
Included in earnings	233	(550)	(105)
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	355	0	31
Issuances	715	711	170
Sales	(1)	0	(27)
Settlements	(741)	(756)	(164)
Transfers into Level 3			0
Transfers out of level 3 and other		0
Other	49		1,605
Ending balance	2,633	2,023	2,618
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	234
Net Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	172	19	12
Included in earnings	(96)	467	63
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	0	0	(1)
Issuances	305	780	63
Sales	0	0	0
Settlements	(393)	(1,094)	(118)
Transfers into Level 3			(10)
Transfers out of level 3 and other		0
Other	0		10
Ending balance	(12)	172	19
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	(8)
Private Equity Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	440	393
Included in earnings	0	2	47
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	0	27	137
Issuances	0	0	0
Sales	0	0	(91)
Settlements	0	(21)	(46)
Transfers into Level 3			0
Transfers out of level 3 and other		(448)
Other	0		0
Ending balance	0	$ 0	$ 440
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	$ 0

Fair Value Measurement With UnobservableI nputs Reconciliation Recurring Basis Asset Merger Additions

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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