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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |  |
Securities available for sale | [1] | $ 22,307 | $ 20,613
Loans held for sale, at fair value |  | 2,911 | 1,946
Mortgage servicing rights |  | 577 | 642
Derivative assets |  | 2,486 | 984
Equity investment securities, at fair value |  | 47 | 47
Total assets |  | 28,328 | 24,232
Liabilities |  |  |
Total derivative liabilities |  | 860 | 322
Total liabilities |  | 860 | 322
Money market mutual fund investments |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | 47 | 47
Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 1,799 | 773
Liabilities |  |  |
Total derivative liabilities |  | 209 | 133
Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 413 | 174
Liabilities |  |  |
Total derivative liabilities |  | 361 | 166
TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 42 |
Liabilities |  |  |
Total derivative liabilities |  | 202 |
Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 232 | 37
Liabilities |  |  |
Total derivative liabilities |  | 88 | 23
Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 41 | 71
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 0 | 0
Equity investment securities, at fair value |  | 47 | 47
Total assets |  | 88 | 118
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Total liabilities |  | 0 | 0
Level 1 | Money market mutual fund investments |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | 47 | 47
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 | TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 |
Liabilities |  |  |
Total derivative liabilities |  | 0 |
Level 1 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 22,266 | 20,542
Loans held for sale, at fair value |  | 2,911 | 1,946
Derivative assets |  | 2,343 | 965
Equity investment securities, at fair value |  | 0 | 0
Total assets |  | 27,520 | 23,453
Liabilities |  |  |
Total derivative liabilities |  | 860 | 322
Total liabilities |  | 860 | 322
Level 2 | Money market mutual fund investments |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | 0 | 0
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 1,799 | 773
Liabilities |  |  |
Total derivative liabilities |  | 209 | 133
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 413 | 174
Liabilities |  |  |
Total derivative liabilities |  | 361 | 166
Level 2 | TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 42 |
Liabilities |  |  |
Total derivative liabilities |  | 202 |
Level 2 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 89 | 18
Liabilities |  |  |
Total derivative liabilities |  | 88 | 23
Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 143 | 19
Equity investment securities, at fair value |  | 0 | 0
Total assets |  | 720 | 661
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Total liabilities |  | 0 | 0
Level 3 | Money market mutual fund investments |  |  |
Assets |  |  |
Equity investment securities, at fair value |  | 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 | TBA contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 |
Liabilities |  |  |
Total derivative liabilities |  | 0 |
Level 3 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 143 | 19
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale |  | 22,262 | 20,537
Mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 22,262 | 20,537
Mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
State and political subdivisions |  |  |
Assets |  |  |
Securities available for sale |  | 4 | 5
State and political subdivisions | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
State and political subdivisions | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 4 | 5
State and political subdivisions | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
U.S. Treasury and other |  |  |
Assets |  |  |
Securities available for sale |  | 41 | 71
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 41 | 71
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 |  | 2,708 | 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 |  | 2,708 | 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 |  | 203 | 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 |  | 203 | 168
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Residential mortgages |  |  |
Assets |  |  |
Mortgage servicing rights |  | 577 | 642
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 |  | $ 577 | $ 642
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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