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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |  |
Debt securities available for sale: | [1] | $ 20,613 | $ 19,895
Loans held for sale, at fair value: |  | 1,946 | 1,219
Mortgage servicing rights |  | 642 | 600
Total derivative assets |  | 984 | 449
Equity investment securities, at fair value |  | 47 | 181
Total assets |  | 24,232 | 22,344
Liabilities |  |  |
Total derivative liabilities |  | 322 | 415
Total liabilities |  | 322 | 415
Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 773 | 306
Liabilities |  |  |
Total derivative liabilities |  | 133 | 277
Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 174 | 129
Liabilities |  |  |
Total derivative liabilities |  | 166 | 113
Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 37 | 14
Liabilities |  |  |
Total derivative liabilities |  | 23 | 25
Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 71 | 24
Loans held for sale, at fair value: |  | 0 | 0
Total derivative assets |  | 0 | 0
Equity investment securities, at fair value |  | 47 | 181
Total assets |  | 118 | 205
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 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 20,542 | 19,871
Loans held for sale, at fair value: |  | 1,946 | 1,219
Total derivative assets |  | 965 | 449
Equity investment securities, at fair value |  | 0 | 0
Total assets |  | 23,453 | 21,539
Liabilities |  |  |
Total derivative liabilities |  | 322 | 415
Total liabilities |  | 322 | 415
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Total derivative assets |  | 773 | 306
Liabilities |  |  |
Total derivative liabilities |  | 133 | 277
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Total derivative assets |  | 174 | 129
Liabilities |  |  |
Total derivative liabilities |  | 166 | 113
Level 2 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 18 | 14
Liabilities |  |  |
Total derivative liabilities |  | 23 | 25
Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Loans held for sale, at fair value: |  | 0 | 0
Total derivative assets |  | 19 | 0
Equity investment securities, at fair value |  | 0 | 0
Total assets |  | 661 | 600
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 | Other contracts |  |  |
Assets |  |  |
Total derivative assets |  | 19 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Mortgage-backed securities |  |  |
Assets |  |  |
Debt securities available for sale: |  | 20,537 | 19,866
Mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 20,537 | 19,866
Mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
State and political subdivisions |  |  |
Assets |  |  |
Debt securities available for sale: |  | 5 | 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: |  | 5 | 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: |  | 71 | 24
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 71 | 24
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: |  | 1,778 | 967
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: |  | 1,778 | 967
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: |  | 168 | 252
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: |  | 168 | 252
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value: |  | 0 | 0
Residential mortgages |  |  |
Assets |  |  |
Mortgage servicing rights |  | 642 | 600
Residential mortgages | Level 1 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
Residential mortgages | Level 2 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 | 0
Residential mortgages | Level 3 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 642 | 600
Money market mutual fund investments |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | 47 | 181
Money market mutual fund investments | Level 1 |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | 47 | 181
Money market mutual fund investments | Level 2 |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | 0 | 0
Money market mutual fund investments | Level 3 |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | $ 0 | $ 0
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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