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Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities $ 833,000,000 $ 836,000,000
Securities available for sale 17,367,000,000 18,139,000,000
Loans, net of unearned income 88,222,000,000 86,405,000,000
Loans held for sale 0 0
Derivative assets, netting adjustments (219,000,000) (443,000,000)
Total derivative assets 738,000,000 669,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, netting adjustments (598,000,000) (616,000,000)
US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 146,000,000 157,000,000
US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 7,000,000 9,000,000
Other Debt Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 20,000,000 20,000,000
Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 1,367,000,000 1,439,000,000
Other Mortgage-Backed Securities [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 1,933,000,000 1,854,000,000
Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 817,000,000 821,000,000
Commercial loans 16,000,000 15,000,000
Total trading account assets 833,000,000 836,000,000
Securities available for sale 17,367,000,000 18,139,000,000
Total other investments 130,000,000 144,000,000
Loans, net of unearned income 3,000,000 2,000,000
Loans held for sale 58,000,000 71,000,000
Derivative assets, gross 957,000,000 1,112,000,000
Derivative assets, netting adjustments (219,000,000) (443,000,000)
Total derivative assets 738,000,000 669,000,000
Accrued income and other assets 0 0
Total assets at fair value 19,129,000,000 19,861,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 1,065,000,000 925,000,000
Recurring [Member] | US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 537,000,000 615,000,000
Securities available for sale 146,000,000 157,000,000
Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 36,000,000 37,000,000
Securities available for sale 7,000,000 9,000,000
Recurring [Member] | Other Debt Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 107,000,000 65,000,000
Securities available for sale 20,000,000 20,000,000
Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 1,933,000,000 1,854,000,000
Recurring [Member] | Principal Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 13,000,000 13,000,000
Recurring [Member] | Principal Investments Indirect [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 109,000,000 124,000,000
Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 122,000,000 137,000,000
Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 7,000,000 7,000,000
Recurring [Member] | Equity Investments Direct, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1,000,000 0
Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 8,000,000 7,000,000
Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 137,000,000 104,000,000
Recurring [Member] | Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 1,367,000,000 1,439,000,000
Recurring [Member] | Short [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 639,000,000 634,000,000
Recurring [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 1,024,000,000 907,000,000
Derivative liabilities, netting adjustments (598,000,000) (616,000,000)
Total derivative liabilities 426,000,000 291,000,000
Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 343,000,000 722,000,000
Recurring [Member] | Interest Rate [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 423,000,000 520,000,000
Recurring [Member] | Foreign Exchange [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 116,000,000 130,000,000
Recurring [Member] | Foreign Exchange [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 103,000,000 124,000,000
Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 494,000,000 255,000,000
Recurring [Member] | Commodity [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 484,000,000 246,000,000
Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 1,000,000
Recurring [Member] | Credit [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 12,000,000 4,000,000
Recurring [Member] | Other [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 4,000,000 4,000,000
Recurring [Member] | Other [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 2,000,000 13,000,000
Level 1 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Commercial loans 0 0
Total trading account assets 0 0
Securities available for sale 0 0
Total other investments 0 0
Loans, net of unearned income 0 0
Loans held for sale 0 0
Derivative assets, gross 84,000,000 100,000,000
Derivative assets, netting adjustments 0 0
Total derivative assets 84,000,000 100,000,000
Accrued income and other assets 0 0
Total assets at fair value 84,000,000 100,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 79,000,000 170,000,000
Level 1 [Member] | Recurring [Member] | US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 [Member] | Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 [Member] | Recurring [Member] | Other Debt Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 [Member] | Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 1 [Member] | Recurring [Member] | Principal Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Recurring [Member] | Principal Investments Indirect [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Recurring [Member] | Equity Investments Direct, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Level 1 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 1 [Member] | Recurring [Member] | Short [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 6,000,000 72,000,000
Level 1 [Member] | Recurring [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 73,000,000 98,000,000
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 73,000,000 98,000,000
Level 1 [Member] | Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 [Member] | Recurring [Member] | Interest Rate [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 1 [Member] | Recurring [Member] | Foreign Exchange [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 84,000,000 100,000,000
Level 1 [Member] | Recurring [Member] | Foreign Exchange [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 73,000,000 98,000,000
Level 1 [Member] | Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 [Member] | Recurring [Member] | Commodity [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 1 [Member] | Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 [Member] | Recurring [Member] | Credit [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 1 [Member] | Recurring [Member] | Other [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 [Member] | Recurring [Member] | Other [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 2 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 817,000,000 821,000,000
Commercial loans 16,000,000 15,000,000
Total trading account assets 833,000,000 836,000,000
Securities available for sale 17,347,000,000 18,119,000,000
Total other investments 0 4,000,000
Loans, net of unearned income 0 0
Loans held for sale 58,000,000 70,000,000
Derivative assets, gross 865,000,000 999,000,000
Derivative assets, netting adjustments 0 0
Total derivative assets 865,000,000 999,000,000
Accrued income and other assets 0 0
Total assets at fair value 19,103,000,000 20,028,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 1,575,000,000 1,371,000,000
Level 2 [Member] | Recurring [Member] | US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 537,000,000 615,000,000
Securities available for sale 146,000,000 157,000,000
Level 2 [Member] | Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 36,000,000 37,000,000
Securities available for sale 7,000,000 9,000,000
Level 2 [Member] | Recurring [Member] | Other Debt Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 107,000,000 65,000,000
Securities available for sale 0 0
Level 2 [Member] | Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 1,933,000,000 1,854,000,000
Level 2 [Member] | Recurring [Member] | Principal Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 [Member] | Recurring [Member] | Principal Investments Indirect [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 [Member] | Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 [Member] | Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 4,000,000
Level 2 [Member] | Recurring [Member] | Equity Investments Direct, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 [Member] | Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 4,000,000
Level 2 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 137,000,000 104,000,000
Level 2 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 1,367,000,000 1,439,000,000
Level 2 [Member] | Recurring [Member] | Short [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 633,000,000 562,000,000
Level 2 [Member] | Recurring [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 942,000,000 809,000,000
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 942,000,000 809,000,000
Level 2 [Member] | Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 338,000,000 713,000,000
Level 2 [Member] | Recurring [Member] | Interest Rate [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 423,000,000 520,000,000
Level 2 [Member] | Recurring [Member] | Foreign Exchange [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 32,000,000 30,000,000
Level 2 [Member] | Recurring [Member] | Foreign Exchange [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 30,000,000 26,000,000
Level 2 [Member] | Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 494,000,000 255,000,000
Level 2 [Member] | Recurring [Member] | Commodity [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 484,000,000 246,000,000
Level 2 [Member] | Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 2 [Member] | Recurring [Member] | Credit [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 3,000,000 4,000,000
Level 2 [Member] | Recurring [Member] | Other [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 1,000,000 1,000,000
Level 2 [Member] | Recurring [Member] | Other [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 2,000,000 13,000,000
Level 3 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Commercial loans 0 0
Total trading account assets 0 0
Securities available for sale 20,000,000 20,000,000
Total other investments 20,000,000 16,000,000
Loans, net of unearned income 3,000,000 2,000,000
Loans held for sale 0 1,000,000
Derivative assets, gross 8,000,000 13,000,000
Derivative assets, netting adjustments 0 0
Total derivative assets 8,000,000 13,000,000
Accrued income and other assets 0 0
Total assets at fair value 51,000,000 52,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 9,000,000 0
Level 3 [Member] | Recurring [Member] | US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 3 [Member] | Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 3 [Member] | Recurring [Member] | Other Debt Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 20,000,000 20,000,000
Level 3 [Member] | Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 3 [Member] | Recurring [Member] | Principal Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 13,000,000 13,000,000
Level 3 [Member] | Recurring [Member] | Principal Investments Indirect [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 3 [Member] | Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 13,000,000 13,000,000
Level 3 [Member] | Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 7,000,000 3,000,000
Level 3 [Member] | Recurring [Member] | Equity Investments Direct, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 3 [Member] | Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 7,000,000 3,000,000
Level 3 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Level 3 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 3 [Member] | Recurring [Member] | Short [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 0 0
Level 3 [Member] | Recurring [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 9,000,000 0
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 9,000,000 0
Level 3 [Member] | Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 5,000,000 9,000,000
Level 3 [Member] | Recurring [Member] | Interest Rate [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 3 [Member] | Recurring [Member] | Foreign Exchange [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 3 [Member] | Recurring [Member] | Foreign Exchange [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 3 [Member] | Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 3 [Member] | Recurring [Member] | Commodity [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 3 [Member] | Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 1,000,000
Level 3 [Member] | Recurring [Member] | Credit [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 9,000,000 0
Level 3 [Member] | Recurring [Member] | Other [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 3,000,000 3,000,000
Level 3 [Member] | Recurring [Member] | Other [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Collateralized Mortgage Obligations [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 13,894,000,000 14,660,000,000
Collateralized Mortgage Obligations [Member] | Level 1 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Collateralized Mortgage Obligations [Member] | Level 2 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 13,894,000,000 14,660,000,000
Collateralized Mortgage Obligations [Member] | Level 3 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale $ 0 $ 0