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Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities $ 811 $ 735
Securities available for sale 33,923 27,556
Loans, net of unearned income (residential) 100,926 101,185
Derivative assets, netting adjustments (258) (380)
Total derivative assets 1,524 1,798
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, netting adjustments (861) (675)
U.S. Treasury, agencies and corporations    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 4,901 1,000
States and political subdivisions    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Other securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 22 13
Agency residential mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 4,026 2,164
Mortgage-backed securities | Agency commercial mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 10,525 10,106
Other    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 8  
Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
Total trading account securities 798 717
Commercial loans 13 18
Total trading account assets 811 735
Securities available for sale 33,923 27,556
Total other investments 88 81
Loans, net of unearned income (residential) 11 11
Loans held for sale (residential) 236 264
Derivative assets, gross 1,782 2,178
Derivative assets, netting adjustments (258) (380)
Total derivative assets 1,524 1,798
Accrued income and other assets 0 0
Total assets at fair value 36,593 30,445
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 926 910
Recurring | U.S. Treasury Bills    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
Recurring | U.S. Treasury, agencies and corporations    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 550 633
Securities available for sale 4,901 1,000
Recurring | States and political subdivisions    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 72 24
Securities available for sale 0 0
Recurring | Other securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 14 13
Securities available for sale 22 13
Recurring | Agency commercial mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 10,525 10,106
Recurring | Principal investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 1
Recurring | Principal Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 52 54
Recurring | Equity Investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 22 13
Recurring | Equity Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 36 27
Recurring | Mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 162 47
Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 4,026 2,164
Recurring | Short positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 743 759
Recurring | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 1,044 826
Derivative liabilities, netting adjustments (861) (675)
Total derivative liabilities 183 151
Recurring | Interest rate    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 1,015 1,584
Recurring | Interest rate | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 318 288
Recurring | Foreign exchange    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 95 109
Recurring | Foreign exchange | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 84 103
Recurring | Commodity    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 638 426
Recurring | Commodity | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 620 408
Recurring | Credit    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 1 1
Recurring | Credit | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 8 11
Recurring | Other    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 33 58
Recurring | Other | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 14 16
Level 1 | Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
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 (residential) 0 0
Derivative assets, gross 74 78
Derivative assets, netting adjustments 0 0
Total derivative assets 74 78
Accrued income and other assets 0 0
Total assets at fair value 74 78
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 207 328
Level 1 | Recurring | U.S. Treasury Bills    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
Level 1 | Recurring | U.S. Treasury, agencies and corporations    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 | Recurring | States and political subdivisions    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 | Recurring | Other securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 1 | Recurring | Agency commercial mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 1 | Recurring | Principal investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 | Recurring | Principal Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 | Recurring | Equity Investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 | Recurring | Equity Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 1 | Recurring | Mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Level 1 | Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 1 | Recurring | Short positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 143 256
Level 1 | Recurring | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 64 72
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 64 72
Level 1 | Recurring | Interest rate    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 | Recurring | Interest rate | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 1 | Recurring | Foreign exchange    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 74 78
Level 1 | Recurring | Foreign exchange | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 64 72
Level 1 | Recurring | Commodity    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 | Recurring | Commodity | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 1 | Recurring | Credit    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 | Recurring | Credit | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 1 | Recurring | Other    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 1 | Recurring | Other | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 2 | Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
Total trading account securities 798 717
Commercial loans 13 18
Total trading account assets 811 735
Securities available for sale 33,901 27,543
Total other investments 13 0
Loans, net of unearned income (residential) 0 0
Loans held for sale (residential) 236 264
Derivative assets, gross 1,669 2,009
Derivative assets, netting adjustments 0 0
Total derivative assets 1,669 2,009
Accrued income and other assets 0 0
Total assets at fair value 36,630 30,551
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 1,572 1,246
Level 2 | Recurring | U.S. Treasury Bills    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
Level 2 | Recurring | U.S. Treasury, agencies and corporations    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 550 633
Securities available for sale 4,901 1,000
Level 2 | Recurring | States and political subdivisions    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 72 24
Securities available for sale 0 0
Level 2 | Recurring | Other securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 14 13
Securities available for sale 0 0
Level 2 | Recurring | Agency commercial mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 10,525 10,106
Level 2 | Recurring | Principal investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 | Recurring | Principal Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 0 0
Level 2 | Recurring | Equity Investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 13 0
Level 2 | Recurring | Equity Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 13 0
Level 2 | Recurring | Mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 162 47
Level 2 | Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 4,026 2,164
Level 2 | Recurring | Short positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 600 503
Level 2 | Recurring | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 972 743
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 972 743
Level 2 | Recurring | Interest rate    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 985 1,528
Level 2 | Recurring | Interest rate | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 318 288
Level 2 | Recurring | Foreign exchange    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 21 31
Level 2 | Recurring | Foreign exchange | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 20 31
Level 2 | Recurring | Commodity    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 638 424
Level 2 | Recurring | Commodity | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 620 408
Level 2 | Recurring | Credit    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 2 | Recurring | Credit | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 3 0
Level 2 | Recurring | Other    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 25 26
Level 2 | Recurring | Other | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 11 16
Level 3 | Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
Total trading account securities 0 0
Commercial loans 0 0
Total trading account assets 0 0
Securities available for sale 22 13
Total other investments 10 14
Loans, net of unearned income (residential) 11 11
Loans held for sale (residential) 0 0
Derivative assets, gross 39 91
Derivative assets, netting adjustments 0 0
Total derivative assets 39 91
Accrued income and other assets 0 0
Total assets at fair value 82 129
LIABILITIES MEASURED ON A RECURRING BASIS    
Total liabilities on a recurring basis at fair value 8 11
Level 3 | Recurring | U.S. Treasury Bills    
ASSETS MEASURED ON A RECURRING BASIS    
Total short-term investments 0 0
Level 3 | Recurring | U.S. Treasury, agencies and corporations    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 3 | Recurring | States and political subdivisions    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 0 0
Level 3 | Recurring | Other securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Securities available for sale 22 13
Level 3 | Recurring | Agency commercial mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 3 | Recurring | Principal investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 1
Level 3 | Recurring | Principal Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 1 1
Level 3 | Recurring | Equity Investments, Direct    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 9 13
Level 3 | Recurring | Equity Investments    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 9 13
Level 3 | Recurring | Mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Total trading account securities 0 0
Level 3 | Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Level 3 | Recurring | Short positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Short positions 0 0
Level 3 | Recurring | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 8 11
Derivative liabilities, netting adjustments 0 0
Total derivative liabilities 8 11
Level 3 | Recurring | Interest rate    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 30 56
Level 3 | Recurring | Interest rate | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 3 | Recurring | Foreign exchange    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 0
Level 3 | Recurring | Foreign exchange | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 3 | Recurring | Commodity    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 0 2
Level 3 | Recurring | Commodity | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 0 0
Level 3 | Recurring | Credit    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross 1 1
Level 3 | Recurring | Credit | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 5 11
Level 3 | Recurring | Other    
ASSETS MEASURED ON A RECURRING BASIS    
Derivative assets, gross   32
Level 3 | Recurring | Other | Long positions    
LIABILITIES MEASURED ON A RECURRING BASIS    
Derivative liabilities, gross 3 0
Measured at NAV | Recurring | Equity Investments Direct, NAV    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 7 7
Measured at NAV | Recurring | Equity Investments Indirect, NAV    
ASSETS MEASURED ON A RECURRING BASIS    
Total other investments 7 7
Agency residential collateralized mortgage obligations | Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 14,449 14,273
Agency residential collateralized mortgage obligations | Level 1 | Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 0 0
Agency residential collateralized mortgage obligations | Level 2 | Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale 14,449 14,273
Agency residential collateralized mortgage obligations | Level 3 | Recurring    
ASSETS MEASURED ON A RECURRING BASIS    
Securities available for sale $ 0 $ 0