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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |  |
Debt securities available for sale: | [1] | $ 26,067 | $ 22,942
Loans held for sale, at fair value: |  | 2,733 | 3,564
Mortgage servicing rights |  | 1,029 | 658
Total derivative assets |  | 1,509 | 2,153
Equity securities, at fair value |  | 102 | 66
Equity securities, at fair value, Fair Value |  | 109 | 66
Total assets |  | 31,440 | 29,383
Liabilities |  |  |
Total derivative liabilities |  | 922 | 634
Total liabilities |  | 922 | 634
Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 692 | 1,566
Liabilities |  |  |
Total derivative liabilities |  | 176 | 217
Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 263 | 320
Liabilities |  |  |
Total derivative liabilities |  | 231 | 291
Commodities contracts |  |  |
Assets |  |  |
Total derivative assets |  | 508 | 62
Liabilities |  |  |
Total derivative liabilities |  | 505 | 61
TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 8 | 8
Liabilities |  |  |
Total derivative liabilities |  | 8 | 65
Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 38 | 197
Liabilities |  |  |
Total derivative liabilities |  | 2 |
Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 11 | 11
Loans held for sale, at fair value: |  | 0 | 0
Total derivative assets |  | 0 | 0
Equity securities, at fair value |  | 95 | 66
Total assets |  | 106 | 77
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Total liabilities |  | 0 | 0
Level 1 | Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | Commodities contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 1 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 |
Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 26,056 | 22,931
Loans held for sale, at fair value: |  | 2,733 | 3,564
Total derivative assets |  | 1,471 | 1,956
Equity securities, at fair value |  | 7 | 0
Total assets |  | 30,267 | 28,451
Liabilities |  |  |
Total derivative liabilities |  | 922 | 634
Total liabilities |  | 922 | 634
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 692 | 1,566
Liabilities |  |  |
Total derivative liabilities |  | 176 | 217
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 263 | 320
Liabilities |  |  |
Total derivative liabilities |  | 231 | 291
Level 2 | Commodities contracts |  |  |
Assets |  |  |
Total derivative assets |  | 508 | 62
Liabilities |  |  |
Total derivative liabilities |  | 505 | 61
Level 2 | TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 8 | 8
Liabilities |  |  |
Total derivative liabilities |  | 8 | 65
Level 2 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 2 |
Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Loans held for sale, at fair value: |  | 0 | 0
Total derivative assets |  | 38 | 197
Equity securities, at fair value |  | 0 | 0
Total assets |  | 1,067 | 855
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Total liabilities |  | 0 | 0
Level 3 | Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | Commodities contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 3 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 38 | 197
Liabilities |  |  |
Total derivative liabilities |  | 0 |
Investments Measured at Net Asset Value |  |  |
Assets |  |  |
Equity securities, at fair value, Fair Value |  | 7 |
Total mortgage-backed securities |  |  |
Assets |  |  |
Debt securities available for sale: |  | 24,847 | 22,928
Total mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Total mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 24,847 | 22,928
Total mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Collateralized loan obligations |  |  |
Assets |  |  |
Debt securities available for sale: |  | 1,207 |
Collateralized loan obligations | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 |
Collateralized loan obligations | Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 1,207 |
Collateralized loan obligations | Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 |
State and political subdivisions |  |  |
Assets |  |  |
Debt securities available for sale: |  | 2 | 3
State and political subdivisions | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
State and political subdivisions | Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 2 | 3
State and political subdivisions | Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
U.S. Treasury and other |  |  |
Assets |  |  |
Debt securities available for sale: |  | 11 | 11
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 11 | 11
U.S. Treasury and other | Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
U.S. Treasury and other | Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Residential loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value: |  | 2,657 | 3,416
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: |  | 2,657 | 3,416
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: |  | 76 | 148
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: |  | 76 | 148
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value: |  | 0 | 0
Mortgage servicing rights |  |  |
Assets |  |  |
Mortgage servicing rights |  | 1,029 | 658
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 |  | $ 1,029 | $ 658
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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