Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Assets
Securities available for sale, fair value	$ 57,415	$ 55,760
Trading securities	1,884	1,726
Mortgage servicing rights	1,323	1,589
Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	57,002	55,171
Securities available for sale, fair value	57,415	55,760
Total financial derivatives	6,930	4,941
Trading securities	1,884	1,726
Total customer resale agreements	138	137
Loans	895	905
Other assets	659	817
Total Assets	72,182	68,804
Liabilities
Total financial derivatives	5,235	3,802
Total trading securities sold short	856	987
Other borrowed funds	63	93
Other liabilities	14	10
Total liabilities	6,168	4,892
Fair Value Additional Information [Abstract]
Fair value net derivative assets	2,510	1,836
Fair value net derivative liabilities	518	640
Net unrealized gains (losses)	49	23
US Treasury and Government Agencies Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	10,472	9,874
Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	25,685	24,820
Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	3,951	4,151
Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	1,870	1,918
Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	4,743	4,903
Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	5,625	5,423
State and Municipal [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,042	2,056
Other Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,614	2,026
Corporate Stocks And Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Securities available for sale, fair value	413	589
Interest Rate Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total financial derivatives	6,674	4,655
Liabilities
Total financial derivatives	4,667	3,132
BlackRock LTIP [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities
Total financial derivatives	208	357
Other Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total financial derivatives	256	286
Liabilities
Total financial derivatives	360	313
Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	780	843
Mortgage servicing rights	863	1,063
Commercial Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	655	641
Mortgage servicing rights	460	526
Direct equity investments [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Equity investments - direct investments	1,156	1,098
Fair Value Additional Information [Abstract]
Direct Investments - Unfunded Commitments	22	23
Indirect Equity Investments [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Equity investments - indirect investments	347	347
Fair Value Additional Information [Abstract]
Indirect Investments - Unfunded Commitments	$ 111	103
Indirect Investments - Estimated remaining liquidation period	12 years
BlackRock Series C Preferred Stock \| Fair Value, Measurements, Recurring [Member]
Assets
Other assets	$ 208	357
Other Assets [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Other assets	451	460
Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Trading securities	1,872	1,717
Liabilities
Total trading securities sold short	856	987
Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Trading securities	12	9
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	9,859	9,267
Securities available for sale, fair value	10,209	9,794
Total financial derivatives	2
Trading securities	774	996
Other assets	250	254
Total Assets	11,235	11,044
Liabilities
Total financial derivatives	3	1
Total trading securities sold short	847	960
Total liabilities	850	961
Level 1 [Member] \| US Treasury and Government Agencies Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	9,859	9,267
Level 1 [Member] \| Corporate Stocks And Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Securities available for sale, fair value	350	527
Level 1 [Member] \| Interest Rate Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total financial derivatives	2
Liabilities
Total financial derivatives	3	1
Level 1 [Member] \| Other Assets [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Other assets	250	254
Level 1 [Member] \| Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Trading securities	762	987
Liabilities
Total trading securities sold short	847	960
Level 1 [Member] \| Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Trading securities	12	9
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	42,838	41,369
Securities available for sale, fair value	42,901	41,431
Total financial derivatives	6,887	4,910
Trading securities	1,108	727
Total customer resale agreements	138	137
Loans	566	565
Other assets	195	199
Total Assets	52,571	48,807
Liabilities
Total financial derivatives	4,899	3,328
Total trading securities sold short	9	27
Other borrowed funds	55	81
Total liabilities	4,963	3,436
Level 2 [Member] \| US Treasury and Government Agencies Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	613	607
Level 2 [Member] \| Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	25,685	24,820
Level 2 [Member] \| Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	141	143
Level 2 [Member] \| Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	1,870	1,918
Level 2 [Member] \| Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	4,743	4,903
Level 2 [Member] \| Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	5,174	4,941
Level 2 [Member] \| State and Municipal [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,028	2,041
Level 2 [Member] \| Other Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,584	1,996
Level 2 [Member] \| Corporate Stocks And Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Securities available for sale, fair value	63	62
Level 2 [Member] \| Interest Rate Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total financial derivatives	6,634	4,626
Liabilities
Total financial derivatives	4,654	3,124
Level 2 [Member] \| Other Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total financial derivatives	253	284
Liabilities
Total financial derivatives	245	204
Level 2 [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	776	838
Level 2 [Member] \| Other Assets [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Other assets	195	199
Level 2 [Member] \| Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Trading securities	1,108	727
Liabilities
Total trading securities sold short	9	27
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	4,305	4,535
Securities available for sale, fair value	4,305	4,535
Total financial derivatives	41	31
Trading securities	2	3
Loans	329	340
Other assets	214	364
Total Assets	8,029	8,606
Liabilities
Total financial derivatives	333	473
Other borrowed funds	8	12
Other liabilities	14	10
Total liabilities	355	495
Level 3 [Member] \| Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	3,810	4,008
Level 3 [Member] \| Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	451	482
Level 3 [Member] \| State and Municipal [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	14	15
Level 3 [Member] \| Other Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	30	30
Level 3 [Member] \| Interest Rate Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total financial derivatives	38	29
Liabilities
Total financial derivatives	10	7
Level 3 [Member] \| BlackRock LTIP [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities
Total financial derivatives	208	357
Level 3 [Member] \| Other Contracts [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total financial derivatives	3	2
Liabilities
Total financial derivatives	115	109
Level 3 [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	4	5
Mortgage servicing rights	863	1,063
Level 3 [Member] \| Commercial Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	655	641
Mortgage servicing rights	460	526
Level 3 [Member] \| Direct equity investments [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Equity investments - direct investments	1,156	1,098
Level 3 [Member] \| BlackRock Series C Preferred Stock \| Fair Value, Measurements, Recurring [Member]
Assets
Other assets	208	357
Level 3 [Member] \| Other Assets [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Other assets	6	7
Level 3 [Member] \| Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Trading securities	$ 2	$ 3

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Estimate remaining period the underlying assets are expected to be liquidated by the investees for investments for which net asset value per share is calculated (including by unit, membership interest, or other ownership interest unit measure), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Fair value portion of federal funds sold and securities borrowed or purchased under agreements to resell.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value portion of other assets.

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Fair value portion of other liabilities.

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No definition available.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities.

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No definition available.

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- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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