Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	$ 789us-gaap_TradingSecurities	$ 750us-gaap_TradingSecurities	$ 840us-gaap_TradingSecurities
Securities available for sale	13,120us-gaap_AvailableForSaleSecurities	13,360us-gaap_AvailableForSaleSecurities	12,359us-gaap_AvailableForSaleSecurities
Derivative asset netting adjustments	(1,071)	(1,034)	(713)
Total derivative assets	731us-gaap_DerivativeAssets	609us-gaap_DerivativeAssets	427us-gaap_DerivativeAssets
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liability netting adjustments	(588)	(542)	(448)
Total derivative liabilities	825us-gaap_DerivativeLiabilities	784us-gaap_DerivativeLiabilities	408us-gaap_DerivativeLiabilities
States and Political Subdivisions [Member]
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	22	23	37
Collateralized Mortgage Obligations [Member]
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	11,163	11,270	10,469
Other Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	33	32	21
Other Mortgage-Backed Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	1,902	2,035	1,832
Recurring [Member]
ASSETS MEASURED ON A RECURRING BASIS
Commercial loans	5	2	2
Total trading account assets	789	750	840
Securities available for sale	13,120	13,360	12,359
Total other investments	384	416	564
Derivative assets	1,802	1,643	1,140
Derivative asset netting adjustments	(1,071)	(1,034)	(713)
Total derivative assets	731	609	427
Accrued income and other assets	2
Total assets at fair value	15,026	15,135	14,190
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	1,413	1,326	856
Derivative liability netting adjustments	(588)	(542)	(448)
Total derivative liabilities	825	784	408
Accrued expense and other liabilities	2
Total liabilities on a recurring basis at fair value	1,434	1,207	871
Recurring [Member] \| U.S. Treasury, Agencies and Corporations [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	668	555	533
Recurring [Member] \| States and Political Subdivisions [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	35	38	46
Securities available for sale	22	23	37
Recurring [Member] \| Collateralized Mortgage Obligations [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities			9
Securities available for sale	11,163	11,270	10,469
Recurring [Member] \| Other Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	30	31	51
Securities available for sale	33	32	21
Recurring [Member] \| Trading Account Assets [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	784	748	838
Recurring [Member] \| Principal Investments Direct [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	74	104	141
Recurring [Member] \| Principal Investments Indirect [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	301	302	403
Recurring [Member] \| Principal Investments [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	375	406	544
Recurring [Member] \| Equity and Mezzanine Investments Indirect [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	10	20
Recurring [Member] \| Private Equity and Mezzanine Investments [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	10	20
Recurring [Member] \| Other Mortgage-Backed Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	51	124	199
Securities available for sale	1,902	2,035	1,832
Recurring [Member] \| Short Positions [Member]
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	607	423	463
Recurring [Member] \| Interest Rate [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	1,044	937	965
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	692	644	687
Recurring [Member] \| Foreign Exchange [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	172	93	60
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	147	81	52
Recurring [Member] \| Commodity [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	581	608	110
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	567	594	105
Recurring [Member] \| Credit [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	5	5	5
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	7	7	12
Level 1 [Member] \| Recurring [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account assets	5	2	4
Securities available for sale	23	22	21
Total other investments	1	2
Derivative assets	164	91	51
Total derivative assets	164	91	51
Total assets at fair value	193	117	76
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	138	77	43
Total derivative liabilities	138	77	43
Total liabilities on a recurring basis at fair value	138	77	46
Level 1 [Member] \| Recurring [Member] \| Other Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	5	2	4
Securities available for sale	23	22	21
Level 1 [Member] \| Recurring [Member] \| Trading Account Assets [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	5	2	4
Level 1 [Member] \| Recurring [Member] \| Principal Investments Direct [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	1	2
Level 1 [Member] \| Recurring [Member] \| Principal Investments [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	1	2
Level 1 [Member] \| Recurring [Member] \| Short Positions [Member]
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities			3
Level 1 [Member] \| Recurring [Member] \| Foreign Exchange [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	164	91	51
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	138	77	43
Level 2 [Member] \| Recurring [Member]
ASSETS MEASURED ON A RECURRING BASIS
Commercial loans	5	2	2
Total trading account assets	784	748	836
Securities available for sale	13,087	13,328	12,338
Derivative assets	1,625	1,536	1,063
Total derivative assets	1,625	1,536	1,063
Accrued income and other assets	2
Total assets at fair value	15,498	15,612	14,237
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	1,274	1,248	812
Total derivative liabilities	1,274	1,248	812
Accrued expense and other liabilities	2
Total liabilities on a recurring basis at fair value	1,883	1,671	1,272
Level 2 [Member] \| Recurring [Member] \| U.S. Treasury, Agencies and Corporations [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	668	555	533
Level 2 [Member] \| Recurring [Member] \| States and Political Subdivisions [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	35	38	46
Securities available for sale	22	23	37
Level 2 [Member] \| Recurring [Member] \| Collateralized Mortgage Obligations [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities			9
Securities available for sale	11,163	11,270	10,469
Level 2 [Member] \| Recurring [Member] \| Other Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	25	29	47
Level 2 [Member] \| Recurring [Member] \| Trading Account Assets [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	779	746	834
Level 2 [Member] \| Recurring [Member] \| Other Mortgage-Backed Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	51	124	199
Securities available for sale	1,902	2,035	1,832
Level 2 [Member] \| Recurring [Member] \| Short Positions [Member]
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	607	423	460
Level 2 [Member] \| Recurring [Member] \| Interest Rate [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	1,034	924	943
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	692	644	687
Level 2 [Member] \| Recurring [Member] \| Foreign Exchange [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	8	2	9
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	9	4	9
Level 2 [Member] \| Recurring [Member] \| Commodity [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	581	608	110
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	567	594	105
Level 2 [Member] \| Recurring [Member] \| Credit [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	2	2	1
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	6	6	11
Level 3 [Member] \| Recurring [Member]
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	10	10
Total other investments	383	414	564
Derivative assets	13	16	26
Total derivative assets	13	16	26
Total assets at fair value	406	440	590
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	1	1	1
Total derivative liabilities	1	1	1
Total liabilities on a recurring basis at fair value	1	1	1
Level 3 [Member] \| Recurring [Member] \| Other Securities [Member]
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	10	10
Level 3 [Member] \| Recurring [Member] \| Principal Investments Direct [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	73	102	141
Level 3 [Member] \| Recurring [Member] \| Principal Investments Indirect [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	301	302	403
Level 3 [Member] \| Recurring [Member] \| Principal Investments [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	374	404	544
Level 3 [Member] \| Recurring [Member] \| Equity and Mezzanine Investments Indirect [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	10	20
Level 3 [Member] \| Recurring [Member] \| Private Equity and Mezzanine Investments [Member]
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	10	20
Level 3 [Member] \| Recurring [Member] \| Interest Rate [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	10	13	22
Level 3 [Member] \| Recurring [Member] \| Credit [Member]
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	3	3	4
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	$ 1	$ 1	$ 1

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Trading Accounts Asset

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Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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