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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |  |
Debt securities available for sale: | [1] | $ 22,942 | $ 20,613
Loans held for sale, at fair value: |  | 3,564 | 1,946
Mortgage servicing rights |  | 658 | 642
Total derivative assets |  | 2,153 | 984
Equity securities, at fair value |  | 66 | 47
Total assets |  | 29,383 | 24,232
Liabilities |  |  |
Total derivative liabilities |  | 634 | 322
Total liabilities |  | 634 | 322
Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 1,566 | 773
Liabilities |  |  |
Total derivative liabilities |  | 217 | 133
Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 320 | 174
Liabilities |  |  |
Total derivative liabilities |  | 291 | 166
TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 8 |
Liabilities |  |  |
Total derivative liabilities |  | 65 |
Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 259 | 37
Liabilities |  |  |
Total derivative liabilities |  | 61 | 23
Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 11 | 71
Loans held for sale, at fair value: |  | 0 | 0
Total derivative assets |  | 0 | 0
Equity securities, at fair value |  | 66 | 47
Total assets |  | 77 | 118
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 | TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 |
Liabilities |  |  |
Total derivative liabilities |  | 0 |
Level 1 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 22,931 | 20,542
Loans held for sale, at fair value: |  | 3,564 | 1,946
Total derivative assets |  | 1,956 | 965
Equity securities, at fair value |  | 0 | 0
Total assets |  | 28,451 | 23,453
Liabilities |  |  |
Total derivative liabilities |  | 634 | 322
Total liabilities |  | 634 | 322
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 1,566 | 773
Liabilities |  |  |
Total derivative liabilities |  | 217 | 133
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 320 | 174
Liabilities |  |  |
Total derivative liabilities |  | 291 | 166
Level 2 | TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 8 |
Liabilities |  |  |
Total derivative liabilities |  | 65 |
Level 2 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 62 | 18
Liabilities |  |  |
Total derivative liabilities |  | 61 | 23
Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Loans held for sale, at fair value: |  | 0 | 0
Total derivative assets |  | 197 | 19
Equity securities, at fair value |  | 0 | 0
Total assets |  | 855 | 661
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 | TBA contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 |
Liabilities |  |  |
Total derivative liabilities |  | 0 |
Level 3 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 197 | 19
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Mortgage-backed securities |  |  |
Assets |  |  |
Debt securities available for sale: |  | 22,928 | 20,537
Mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 22,928 | 20,537
Mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
State and political subdivisions |  |  |
Assets |  |  |
Debt securities available for sale: |  | 3 | 5
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: |  | 3 | 5
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 | 71
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 11 | 71
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: |  | 3,416 | 1,778
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: |  | 3,416 | 1,778
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: |  | 148 | 168
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: |  | 148 | 168
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value: |  | 0 | 0
MSRs |  |  |
Assets |  |  |
Mortgage servicing rights |  | 658 | 642
MSRs | Level 1 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
MSRs | Level 2 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
MSRs | Level 3 |  |  |
Assets |  |  |
Mortgage servicing rights |  | $ 658 | $ 642
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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