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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |  |
Fair Value | [1] | $ 31,187 | $ 29,777
Loans held for sale, at fair value |  | 505 | 676
Mortgage servicing rights |  | 1,564 | 1,552
Derivative assets |  | 1,591 | 1,593
Equity securities, at fair value |  | 118 | 115
Short-term investments |  | 21 |
Total assets |  | 34,986 | 33,713
Liabilities |  |  |
Total derivative liabilities |  | 2,276 | 2,183
Short-term borrowed funds |  | 9 |
Total liabilities |  | 2,285 | 2,183
Equity securities excluded from investments |  | 178 | 173
Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 481 | 464
Liabilities |  |  |
Total derivative liabilities |  | 1,316 | 1,149
Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 389 | 434
Liabilities |  |  |
Total derivative liabilities |  | 290 | 378
Commodities contracts |  |  |
Assets |  |  |
Derivative assets |  | 711 | 685
Liabilities |  |  |
Total derivative liabilities |  | 665 | 640
TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 2 | 3
Liabilities |  |  |
Total derivative liabilities |  | 5 | 16
Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 8 | 7
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 |  |  |
Assets |  |  |
Fair Value |  | 4,770 | 4,380
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 0 | 0
Equity securities, at fair value |  | 118 | 115
Short-term investments |  | 10 |
Total assets |  | 4,898 | 4,495
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Short-term borrowed funds |  | 0 |
Total liabilities |  | 0 | 0
Level 1 | Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | Commodities contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 2 |  |  |
Assets |  |  |
Fair Value |  | 26,417 | 25,397
Loans held for sale, at fair value |  | 505 | 676
Derivative assets |  | 1,583 | 1,586
Equity securities, at fair value |  | 0 | 0
Short-term investments |  | 11 |
Total assets |  | 28,516 | 27,659
Liabilities |  |  |
Total derivative liabilities |  | 2,276 | 2,183
Short-term borrowed funds |  | 9 |
Total liabilities |  | 2,285 | 2,183
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 481 | 464
Liabilities |  |  |
Total derivative liabilities |  | 1,316 | 1,149
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 389 | 434
Liabilities |  |  |
Total derivative liabilities |  | 290 | 378
Level 2 | Commodities contracts |  |  |
Assets |  |  |
Derivative assets |  | 711 | 685
Liabilities |  |  |
Total derivative liabilities |  | 665 | 640
Level 2 | TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 2 | 3
Liabilities |  |  |
Total derivative liabilities |  | 5 | 16
Level 2 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 8 | 7
Equity securities, at fair value |  | 0 | 0
Short-term investments |  | 0 |
Total assets |  | 1,572 | 1,559
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Short-term borrowed funds |  | 0 |
Total liabilities |  | 0 | 0
Level 3 | Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | Commodities contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 8 | 7
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Fair Value Measured at Net Asset Value Per Share |  |  |
Liabilities |  |  |
Equity securities excluded from investments |  | 60 | 58
Unfunded capital commitments |  | 25 | 28
Mortgage-backed securities |  |  |
Assets |  |  |
Fair Value |  | 26,122 | 24,732
Mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
Mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Fair Value |  | 26,122 | 24,732
Mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
Collateralized loan obligations |  |  |
Assets |  |  |
Fair Value |  | 294 | 664
Collateralized loan obligations | Level 1 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
Collateralized loan obligations | Level 2 |  |  |
Assets |  |  |
Fair Value |  | 294 | 664
Collateralized loan obligations | Level 3 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
State and political subdivisions |  |  |
Assets |  |  |
Fair Value |  | 1 | 1
State and political subdivisions | Level 1 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
State and political subdivisions | Level 2 |  |  |
Assets |  |  |
Fair Value |  | 1 | 1
State and political subdivisions | Level 3 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
U.S. Treasury and other |  |  |
Assets |  |  |
Fair Value |  | 4,770 | 4,380
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Fair Value |  | 4,770 | 4,380
U.S. Treasury and other | Level 2 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
U.S. Treasury and other | Level 3 |  |  |
Assets |  |  |
Fair Value |  | 0 | 0
Residential loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 437 | 614
Residential loans held for sale | Level 1 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Residential loans held for sale | Level 2 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 437 | 614
Residential loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Commercial loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 68 | 62
Commercial loans held for sale | Level 1 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Commercial loans held for sale | Level 2 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 68 | 62
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Mortgage servicing rights |  |  |
Assets |  |  |
Mortgage servicing rights |  | 1,564 | 1,552
Mortgage servicing rights | Level 1 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
Mortgage servicing rights | Level 2 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
Mortgage servicing rights | Level 3 |  |  |
Assets |  |  |
Mortgage servicing rights |  | $ 1,564 | $ 1,552
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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