Fair Value Disclosures (Roll Forward of Level 3 Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Mortgage banking income	$ 107	$ 117	$ 267	$ 465
Covered Securities [Member]
Beginning balance	810	953	861	994
Interest income	7	12	24	30
Mortgage banking income	0	0	0	0
Other noninterest income	0	0	0	0
Included in unrealized net holding gains (losses) in OCI	(11)	(17)	(26)	(7)
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(31)	(46)	(84)	(115)
Ending balance	775	902	775	902
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	7	12	24	30
Residential MSRs [Member]
Beginning balance	954	892	1,047	627
Interest income	0	0	0	0
Mortgage banking income	(19)	22	(116)	177
Other noninterest income	0	0	0	0
Included in unrealized net holding gains (losses) in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	39	77	105	269
Sales	0	0	0	0
Settlements	(31)	(35)	(93)	(117)
Ending balance	943	956	943	956
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	(19)	22	(116)	177
Net Derivatives [Member]
Beginning balance	24	(89)	(11)	54
Interest income	0	0	0	0
Mortgage banking income	26	(91)	70	(26)
Other noninterest income	0	0	0	0
Included in unrealized net holding gains (losses) in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	11	31	51	58
Sales	0	0	0	0
Settlements	(51)	195	(100)	(40)
Ending balance	10	46	10	46
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	10	46	10	46
Private Equity and Similar Investments [Member]
Beginning balance	322	269	291	323
Interest income	0	0	0	0
Mortgage banking income	0	0	0	0
Other noninterest income	0	6	12	17
Included in unrealized net holding gains (losses) in OCI	0	0	0	0
Purchases	5	23	57	53
Issuances	0	0	0	0
Sales	(20)	(8)	(50)	(97)
Settlements	(2)	(2)	(6)	(8)
Transfers into Level 3	0		1
Ending balance	305	288	305	288
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at end of period	$ (1)	$ 5	$ (5)	$ 13

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

No definition available.

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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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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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-Name Regulation S-X (SX)

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-Article 5

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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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