Fair Value Disclosures - Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Total realized and unrealized gains (losses): Included in earnings:
Mortgage banking income	$ 91	$ 110
Acquired from FDIC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	626	745
Total realized and unrealized gains (losses): Included in earnings:
Interest income	15	11
Included in unrealized net holding gains (losses) in OCI	(20)	(14)
Settlements	(21)	(23)
Ending balance	600	719
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	15	11
MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	880	844
Total realized and unrealized gains (losses): Included in earnings:
Mortgage banking income	(127)	(71)
Issuances	22	26
Settlements	(38)	(35)
Other	123
Ending balance	860	764
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	(127)	(71)
Net Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4	17
Total realized and unrealized gains (losses): Included in earnings:
Mortgage banking income	32	28
Other noninterest income		(4)
Issuances	40	38
Settlements	(55)	(56)
Ending balance	21	23
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	21	23
Private Equity and Similar Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	289	329
Total realized and unrealized gains (losses): Included in earnings:
Other noninterest income	3	16
Purchases	19	42
Sales	(8)	(19)
Settlements	(2)	(2)
Ending balance	301	366
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held	$ 2	$ 16

Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Assets, Other

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Net unrealized gains (losses) included in net income relating to assets and liabilities at end of period

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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 other comprehensive income (loss) for 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 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 sale 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 settlement 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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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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Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

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