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Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities $ 849 $ 836
Securities available for sale 19,428 18,139
Loans, net of unearned income (residential) 89,552 86,405
Netting adjustments (333) (443)
Total derivative assets 531 669
LIABILITIES MEASURED ON A RECURRING BASIS    
Netting adjustments (337) (616)
Government and agency bonds - U.S. [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 147 157
State and municpal bonds [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 7 9
Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 20 20
Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 2,105 1,439
Other Mortgage-Backed Securities [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 3,187 1,854
Fair Value, Measurements, Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 824 821
Commercial loans 25 15
Total trading account assets 849 836
Securities available for sale 19,428 18,139
Total other investments 115 144
Loans, net of unearned income (residential) 3 2
Loans held for sale 54 71
Derivative assets 864 1,112
Netting adjustments (333) (443)
Total derivative assets 531 669
Total assets on a recurring basis at fair value 20,980 19,861
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 930 925
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 13,962 14,660
Fair Value, Measurements, Recurring [Member] | Government and agency bonds - U.S. [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 578 615
Securities available for sale 147 157
Fair Value, Measurements, Recurring [Member] | State and municpal bonds [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 60 37
Securities available for sale 7 9
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 22 65
Securities available for sale 20 20
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 3,187 1,854
Fair Value, Measurements, Recurring [Member] | Principal Direct Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 13
Fair Value, Measurements, Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 97 137
Fair Value, Measurements, Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 8 7
Fair Value, Measurements, Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 18 7
Fair Value, Measurements, Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 164 104
Fair Value, Measurements, Recurring [Member] | Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 2,105 1,439
Fair Value, Measurements, Recurring [Member] | Short Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 544 634
Fair Value, Measurements, Recurring [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 723 907
Netting adjustments (337) (616)
Total derivative liabilities 386 291
Fair Value, Measurements, Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 415 722
Fair Value, Measurements, Recurring [Member] | Interest Rate [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 297 520
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 106 130
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 95 124
Fair Value, Measurements, Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 333 255
Fair Value, Measurements, Recurring [Member] | Commodity [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 323 246
Fair Value, Measurements, Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 1 1
Fair Value, Measurements, Recurring [Member] | Credit [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 1 4
Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 9 4
Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 7 13
Level 1 [Member] | Fair Value, Measurements, 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 (residential) 0 0
Loans held for sale 0 0
Derivative assets 70 100
Netting adjustments 0 0
Total derivative assets 70 100
Total assets on a recurring basis at fair value 70 100
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 72 170
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Government and agency bonds - U.S. [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | State and municpal bonds [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Principal Direct Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Level 1 [Member] | Fair Value, Measurements, 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] | Fair Value, Measurements, Recurring [Member] | Short Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 14 72
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 58 98
Netting adjustments 0 0
Total derivative liabilities 58 98
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 70 100
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 58 98
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Credit [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 0 0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 824 821
Commercial loans 25 15
Total trading account assets 849 836
Securities available for sale 19,408 18,119
Total other investments 1 4
Loans, net of unearned income (residential) 0 0
Loans held for sale 54 70
Derivative assets 786 999
Netting adjustments 0 0
Total derivative assets 786 999
Total assets on a recurring basis at fair value 21,098 20,028
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 1,195 1,371
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 13,962 14,660
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Government and agency bonds - U.S. [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 578 615
Securities available for sale 147 157
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | State and municpal bonds [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 60 37
Securities available for sale 7 9
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 22 65
Securities available for sale 0 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 3,187 1,854
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Principal Direct Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 164 104
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 2,105 1,439
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Short Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 530 562
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 665 809
Netting adjustments 0 0
Total derivative liabilities 665 809
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 410 713
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 297 520
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 36 30
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 37 26
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 333 255
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 323 246
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 1 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Credit [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 1 4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 6 1
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 7 13
Level 3 [Member] | Fair Value, Measurements, 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 20
Total other investments 8 16
Loans, net of unearned income (residential) 3 2
Loans held for sale 0 1
Derivative assets 8 13
Netting adjustments 0 0
Total derivative assets 8 13
Total assets on a recurring basis at fair value 39 52
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Government and agency bonds - U.S. [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | State and municpal bonds [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 20 20
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Principal Direct Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 13
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Principal Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 13
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments Direct [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 7 3
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 7 3
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Mortgage-Backed Securities [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Level 3 [Member] | Fair Value, Measurements, 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] | Fair Value, Measurements, Recurring [Member] | Short Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Netting adjustments 0 0
Total derivative liabilities 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 5 9
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commodity [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Credit [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 0 1
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Credit [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets 3 3
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member] | Long Positions [Member]    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities 0 0
Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Measurements, Recurring [Member] | Principal Indirect Investments [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 96 124
Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments Direct, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 0
Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Measurements, Recurring [Member] | Equity Investments Indirect, NAV [Member]    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments $ 9 $ 0