Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The fair value as of the balance sheet date of firm holdings in private equity, mezzanine, venture capital, merchant banking, real estate and special situations investments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Fair value of obligations incurred from short sales.

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Fair Value Disclosures (Schedule of Assets and Liabilities Measured at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Trading securities	$ 482us-gaap_TradingSecurities	$ 381us-gaap_TradingSecurities
AFS securities	20,907us-gaap_AvailableForSaleSecurities	22,104us-gaap_AvailableForSaleSecurities
LHFS	1,423	1,222
Residential MSRs	844us-gaap_ServicingAssetAtFairValueAmount	1,047us-gaap_ServicingAssetAtFairValueAmount	627us-gaap_ServicingAssetAtFairValueAmount	563us-gaap_ServicingAssetAtFairValueAmount
Private equity and similar investments	329	291
Assets measured at fair value	25,107us-gaap_AssetsFairValueDisclosure	25,909us-gaap_AssetsFairValueDisclosure
Short-term borrowings	148	84
Total liabilities	1,161us-gaap_LiabilitiesFairValueDisclosure	1,054us-gaap_LiabilitiesFairValueDisclosure
Level 1 [Member]
Trading securities	289	256
LHFS	0	0
Residential MSRs	0	0
Private equity and similar investments	0	0
Assets measured at fair value	295	266
Short-term borrowings	0	0
Total liabilities	0	0
Level 2 [Member]
Trading securities	193	125
LHFS	1,423	1,222
Residential MSRs	0	0
Private equity and similar investments	0	0
Assets measured at fair value	22,874	23,441
Short-term borrowings	148	84
Total liabilities	1,158	1,040
Level 3 [Member]
Trading securities	0	0
LHFS	0	0
Residential MSRs	844	1,047
Private equity and similar investments	329	291
Assets measured at fair value	1,938	2,202
Short-term borrowings	0	0
Total liabilities	3	14
U.S. Treasury Securities
AFS securities	1,231	595
U.S. Treasury Securities \| Level 2 [Member]
AFS securities	1,231	595
MBS Issued by GSE
AFS securities	16,154	17,929
MBS Issued by GSE \| Level 2 [Member]
AFS securities	16,154	17,929
States and Political Subdivisions [Member]
AFS securities	1,974	1,851
States and Political Subdivisions [Member] \| Level 2 [Member]
AFS securities	1,974	1,851
Non-Agency MBS [Member]
AFS securities	264	291
Non-Agency MBS [Member] \| Level 2 [Member]
AFS securities	264	291
Other Securities [Member]
AFS securities	41	45
Other Securities [Member] \| Level 1 [Member]
AFS securities	6	10
Other Securities [Member] \| Level 2 [Member]
AFS securities	35	35
Securities Acquired from FDIC [Member]
AFS securities	1,243	1,393
Securities Acquired from FDIC [Member] \| Level 2 [Member]
AFS securities	498	532
Securities Acquired from FDIC [Member] \| Level 3 [Member]
AFS securities	745	861
Interest Rate Contract [Member]
Derivative assets	1,114	862
Derivative liabilities	1,007	967
Interest Rate Contract [Member] \| Level 2 [Member]
Derivative assets	1,094	859
Derivative liabilities	1,004	953
Interest Rate Contract [Member] \| Level 3 [Member]
Derivative assets	20	3
Derivative liabilities	3	14
Foreign Exchange Contracts [Member]
Derivative assets	8	2
Derivative liabilities	6	3
Foreign Exchange Contracts [Member] \| Level 2 [Member]
Derivative assets	8	2
Derivative liabilities	$ 6	$ 3