Fair Value Disclosures (Roll Forward of Level 3 Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Mortgage banking income	$ 395	$ 565	$ 840
Securities Acquired from FDIC [Member]
Beginning balance	861	994	984
Interest income	33	37	48
Mortgage banking income	0	0	0
Other noninterest income	0	0	0
Included in unrealized net holding gains (losses) in OCI	(38)	(14)	88
Purchases	0	0
Issuances	0	0	0
Sales	0	0	0
Settlements	(111)	(156)	(126)
Ending balance	745	861	994
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	33	37	48
Residential MSRs [Member]
Beginning balance	1,047	627	563
Interest income	0	0	0
Mortgage banking income	(221)	229	(32)
Other noninterest income	0	0	0
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	0	0
Issuances	141	336	270
Sales	0	0	0
Settlements	(123)	(145)	(174)
Ending balance	844	1,047	627
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	(221)	229	(32)
Net Derivatives [Member]
Beginning balance	(11)	54	59
Interest income	0	0	0
Mortgage banking income	94	21	458
Other noninterest income	(2)	0	0
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	0	0
Issuances	75	65	308
Sales	0	0	0
Settlements	(139)	(151)	(771)
Ending balance	17	(11)	54
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	17	(11)	54
Private Equity and Similar Investments [Member]
Beginning balance	291	323	261
Interest income	0	0	0
Mortgage banking income	0	0	0
Other noninterest income	27	33	21
Included in unrealized net holding gains (losses) in OCI	0	0	0
Purchases	67	58	101
Issuances	0	0	0
Sales	(50)	(59)	(59)
Settlements	(7)	(64)	(1)
Transfers into Level 3	1
Ending balance	329	291	323
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	$ 15	$ 22	$ 12

Net unrealized gains (losses) included in net income relating to assets and liabilities at end of 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 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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Amount of transfer of financial instrument classified as an asset into 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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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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