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Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities $ 979,000,000 $ 849,000,000
Securities available for sale 20,854,000,000 19,428,000,000
Loans, net of unearned income 90,178,000,000 89,552,000,000
Loans held for sale   0
Derivative assets, netting adjustments (324,000,000) (333,000,000)
Total derivative assets 526,000,000 531,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, netting adjustments (336,000,000) (337,000,000)
US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 270,000,000 147,000,000
US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 6,000,000 7,000,000
Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 25,000,000 20,000,000
Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 2,143,000,000 2,105,000,000
Other Mortgage-Backed Securities [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 4,330,000,000 3,187,000,000
Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 946,000,000 824,000,000
Commercial loans 33,000,000 25,000,000
Total trading account assets 979,000,000 849,000,000
Securities available for sale 20,854,000,000 19,428,000,000
Total other investments 103,000,000 115,000,000
Loans, net of unearned income 3,000,000 3,000,000
Loans held for sale 71,000,000 54,000,000
Derivative assets, gross 850,000,000 864,000,000
Derivative assets, netting adjustments (324,000,000) (333,000,000)
Total derivative assets 526,000,000 531,000,000
Accrued income and other assets 0 0
Total assets at fair value 22,536,000,000 20,980,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 882,000,000 930,000,000
Recurring [Member] | US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 746,000,000 578,000,000
Securities available for sale 270,000,000 147,000,000
Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 46,000,000 60,000,000
Securities available for sale 6,000,000 7,000,000
Recurring [Member] | Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 69,000,000 22,000,000
Securities available for sale 25,000,000 20,000,000
Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 4,330,000,000 3,187,000,000
Recurring [Member] | Principal Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1,000,000 1,000,000
Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 84,000,000 97,000,000
Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 9,000,000 8,000,000
Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 19,000,000 18,000,000
Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 85,000,000 164,000,000
Recurring [Member] | Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 2,143,000,000 2,105,000,000
Recurring [Member] | Short [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 679,000,000 544,000,000
Recurring [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 539,000,000 723,000,000
Derivative liabilities, netting adjustments (336,000,000) (337,000,000)
Total derivative liabilities 203,000,000 386,000,000
Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 529,000,000 415,000,000
Recurring [Member] | Interest Rate [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 237,000,000 297,000,000
Recurring [Member] | Foreign Exchange [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 76,000,000 106,000,000
Recurring [Member] | Foreign Exchange [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 68,000,000 95,000,000
Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 233,000,000 333,000,000
Recurring [Member] | Commodity [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 223,000,000 323,000,000
Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 1,000,000 1,000,000
Recurring [Member] | Credit [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 3,000,000 1,000,000
Recurring [Member] | Other [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 11,000,000 9,000,000
Recurring [Member] | Other [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 8,000,000 7,000,000
Level 1 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 1,000,000 0
Commercial loans 0 0
Total trading account assets 1,000,000 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 45,000,000 70,000,000
Derivative assets, netting adjustments 0 0
Total derivative assets 45,000,000 70,000,000
Accrued income and other assets 0 0
Total assets at fair value 46,000,000 70,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 46,000,000 72,000,000
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 Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 1,000,000 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 [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
Level 1 [Member] | Recurring [Member] | Equity Investments Direct, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 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 10,000,000 14,000,000
Level 1 [Member] | Recurring [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 36,000,000 58,000,000
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 36,000,000 58,000,000
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 45,000,000 70,000,000
Level 1 [Member] | Recurring [Member] | Foreign Exchange [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 36,000,000 58,000,000
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 945,000,000 824,000,000
Commercial loans 33,000,000 25,000,000
Total trading account assets 978,000,000 849,000,000
Securities available for sale 20,829,000,000 19,408,000,000
Total other investments 1,000,000 1,000,000
Loans, net of unearned income 0 0
Loans held for sale 70,000,000 54,000,000
Derivative assets, gross 798,000,000 786,000,000
Derivative assets, netting adjustments 0 0
Total derivative assets 798,000,000 786,000,000
Accrued income and other assets 0 0
Total assets at fair value 22,676,000,000 21,098,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 1,171,000,000 1,195,000,000
Level 2 [Member] | Recurring [Member] | US Treasury and Government [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 746,000,000 578,000,000
Securities available for sale 270,000,000 147,000,000
Level 2 [Member] | Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 46,000,000 60,000,000
Securities available for sale 6,000,000 7,000,000
Level 2 [Member] | Recurring [Member] | Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 68,000,000 22,000,000
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 4,330,000,000 3,187,000,000
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 [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 1,000,000 1,000,000
Level 2 [Member] | Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1,000,000 1,000,000
Level 2 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 85,000,000 164,000,000
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 2,143,000,000 2,105,000,000
Level 2 [Member] | Recurring [Member] | Short [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 669,000,000 530,000,000
Level 2 [Member] | Recurring [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 502,000,000 665,000,000
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 502,000,000 665,000,000
Level 2 [Member] | Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 526,000,000 410,000,000
Level 2 [Member] | Recurring [Member] | Interest Rate [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 237,000,000 297,000,000
Level 2 [Member] | Recurring [Member] | Foreign Exchange [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 31,000,000 36,000,000
Level 2 [Member] | Recurring [Member] | Foreign Exchange [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 32,000,000 37,000,000
Level 2 [Member] | Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 233,000,000 333,000,000
Level 2 [Member] | Recurring [Member] | Commodity [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 223,000,000 323,000,000
Level 2 [Member] | Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 1,000,000 1,000,000
Level 2 [Member] | Recurring [Member] | Credit [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 2,000,000 1,000,000
Level 2 [Member] | Recurring [Member] | Other [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 7,000,000 6,000,000
Level 2 [Member] | Recurring [Member] | Other [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 8,000,000 7,000,000
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 25,000,000 20,000,000
Total other investments 9,000,000 8,000,000
Loans, net of unearned income 3,000,000 3,000,000
Loans held for sale 1,000,000 0
Derivative assets, gross 7,000,000 8,000,000
Derivative assets, netting adjustments 0 0
Total derivative assets 7,000,000 8,000,000
Accrued income and other assets 0 0
Total assets at fair value 45,000,000 39,000,000
LIABILITIES MEASURED ON A RECURRING BASIS    
Accrued expense and other liabilities 0 0
Total liabilities on a recurring basis at fair value 1,000,000 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 Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 25,000,000 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 1,000,000 1,000,000
Level 3 [Member] | Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1,000,000 1,000,000
Level 3 [Member] | Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 8,000,000 7,000,000
Level 3 [Member] | Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 8,000,000 7,000,000
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 1,000,000 0
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 1,000,000 0
Level 3 [Member] | Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 3,000,000 5,000,000
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 0
Level 3 [Member] | Recurring [Member] | Credit [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 1,000,000 0
Level 3 [Member] | Recurring [Member] | Other [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 4,000,000 3,000,000
Level 3 [Member] | Recurring [Member] | Other [Member] | Long [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Measured at NAV [Member] | Recurring [Member] | Principal Investments Indirect [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 83,000,000 96,000,000
Measured at NAV [Member] | Recurring [Member] | Equity Investments Direct, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1,000,000 1,000,000
Measured at NAV [Member] | Recurring [Member] | Equity Investments Indirect, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 9,000,000 9,000,000
Collateralized Mortgage Obligations [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 14,080,000,000 13,962,000,000
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 14,080,000,000 13,962,000,000
Collateralized Mortgage Obligations [Member] | Level 3 [Member] | Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale $ 0 $ 0