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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |  |
Securities available for sale | [1] | $ 24,583 | $ 22,942
Loans held for sale, at fair value |  | 3,616 | 3,564
Mortgage servicing rights |  | 902 | 658
Derivative assets |  | 1,925 | 2,153
Equity securities, at fair value |  | 80 | 66
Total assets |  | 31,106 | 29,383
Liabilities |  |  |
Total derivative liabilities |  | 861 | 634
Total liabilities |  | 861 | 634
Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 1,134 | 1,566
Liabilities |  |  |
Total derivative liabilities |  | 197 | 217
Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 273 | 320
Liabilities |  |  |
Total derivative liabilities |  | 209 | 291
Derivatives hedging commodity price risk |  |  |
Assets |  |  |
Derivative assets |  | 424 | 62
Liabilities |  |  |
Total derivative liabilities |  | 427 | 61
TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 5 | 8
Liabilities |  |  |
Total derivative liabilities |  | 28 | 65
Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 89 | 197
Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 11 | 11
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 0 | 0
Equity securities, at fair value |  | 80 | 66
Total assets |  | 91 | 77
Liabilities |  |  |
Total derivative liabilities |  | 0 | 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 | Derivatives hedging commodity price risk |  |  |
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
Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 24,572 | 22,931
Loans held for sale, at fair value |  | 3,616 | 3,564
Derivative assets |  | 1,836 | 1,956
Equity securities, at fair value |  | 0 | 0
Total assets |  | 30,024 | 28,451
Liabilities |  |  |
Total derivative liabilities |  | 861 | 634
Total liabilities |  | 861 | 634
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 1,134 | 1,566
Liabilities |  |  |
Total derivative liabilities |  | 197 | 217
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 273 | 320
Liabilities |  |  |
Total derivative liabilities |  | 209 | 291
Level 2 | Derivatives hedging commodity price risk |  |  |
Assets |  |  |
Derivative assets |  | 424 | 62
Liabilities |  |  |
Total derivative liabilities |  | 427 | 61
Level 2 | TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 5 | 8
Liabilities |  |  |
Total derivative liabilities |  | 28 | 65
Level 2 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 89 | 197
Equity securities, at fair value |  | 0 | 0
Total assets |  | 991 | 855
Liabilities |  |  |
Total derivative liabilities |  | 0 | 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 | Derivatives hedging commodity price risk |  |  |
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 |  | 89 | 197
Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale |  | 24,392 | 22,928
Mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 24,392 | 22,928
Mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Collateralized loan obligations, at fair value |  |  |
Assets |  |  |
Securities available for sale |  | 177 |
Collateralized loan obligations, at fair value | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 0 |
Collateralized loan obligations, at fair value | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 177 |
Collateralized loan obligations, at fair value | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 |
State and political subdivisions |  |  |
Assets |  |  |
Securities available for sale |  | 3 | 3
State and political subdivisions | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
State and political subdivisions | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 3 | 3
State and political subdivisions | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
U.S. Treasury and other |  |  |
Assets |  |  |
Securities available for sale |  | 11 | 11
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 11 | 11
U.S. Treasury and other | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
U.S. Treasury and other | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Residential loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 3,499 | 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 |  | 3,499 | 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 |  | 117 | 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 |  | 117 | 148
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Residential mortgages (2) |  |  |
Assets |  |  |
Mortgage servicing rights |  | 902 | 658
Residential mortgages (2) | Level 1 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
Residential mortgages (2) | Level 2 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
Residential mortgages (2) | Level 3 |  |  |
Assets |  |  |
Mortgage servicing rights |  | $ 902 | $ 658
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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