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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |  |
Debt securities available for sale: | [1] | $ 19,895 | $ 20,157
Loans held for sale, at fair value: |  | 1,219 | 497
Mortgage servicing rights |  | 600 |
Derivative assets |  | 449 | 693
Equity securities, at fair value: |  |  |
Money market mutual fund investments |  | 181 | 165
Other investments |  | 0 | 4
Total equity securities, at fair value |  | 181 | 169
Total assets |  | 22,344 | 21,516
Liabilities |  |  |
Total derivative liabilities |  | 415 | 533
Total liabilities |  | 415 | 533
Interest rate swaps |  |  |
Assets |  |  |
Derivative assets |  | 306 | 538
Liabilities |  |  |
Total derivative liabilities |  | 277 | 379
Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 129 | 148
Liabilities |  |  |
Total derivative liabilities |  | 113 | 149
Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 14 | 7
Liabilities |  |  |
Total derivative liabilities |  | 25 | 5
Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 24 | 12
Loans held for sale, at fair value: |  | 0 | 0
Derivative assets |  | 0 | 0
Equity securities, at fair value: |  |  |
Money market mutual fund investments |  | 181 | 165
Other investments |  | 0 | 0
Total equity securities, at fair value |  | 181 | 165
Total assets |  | 205 | 177
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Total liabilities |  | 0 | 0
Level 1 | Interest rate swaps |  |  |
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 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 19,871 | 20,145
Loans held for sale, at fair value: |  | 1,219 | 497
Derivative assets |  | 449 | 693
Equity securities, at fair value: |  |  |
Money market mutual fund investments |  | 0 | 0
Other investments |  | 0 | 4
Total equity securities, at fair value |  | 0 | 4
Total assets |  | 21,539 | 21,339
Liabilities |  |  |
Total derivative liabilities |  | 415 | 533
Total liabilities |  | 415 | 533
Level 2 | Interest rate swaps |  |  |
Assets |  |  |
Derivative assets |  | 306 | 538
Liabilities |  |  |
Total derivative liabilities |  | 277 | 379
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 129 | 148
Liabilities |  |  |
Total derivative liabilities |  | 113 | 149
Level 2 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 14 | 7
Liabilities |  |  |
Total derivative liabilities |  | 25 | 5
Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Loans held for sale, at fair value: |  | 0 | 0
Derivative assets |  | 0 | 0
Equity securities, at fair value: |  |  |
Money market mutual fund investments |  | 0 | 0
Other investments |  | 0 | 0
Total equity securities, at fair value |  | 0 | 0
Total assets |  | 600 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Total liabilities |  | 0 | 0
Level 3 | Interest rate swaps |  |  |
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 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Mortgage-backed securities |  |  |
Assets |  |  |
Debt securities available for sale: |  | 19,866 | 20,139
Mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
Mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 19,866 | 20,139
Mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 0 | 0
State and political subdivisions |  |  |
Assets |  |  |
Debt securities available for sale: |  | 5 | 6
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 | 6
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: |  | 24 | 12
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Debt securities available for sale: |  | 24 | 12
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: |  | 967 | 326
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: |  | 967 | 326
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: |  | 252 | 171
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: |  | 252 | 171
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value: |  | 0 | $ 0
Residential mortgages |  |  |
Assets |  |  |
Mortgage servicing rights |  | 600 |
Residential mortgages | Level 1 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 |
Residential mortgages | Level 2 |  |  |
Assets |  |  |
Mortgage servicing rights |  | 0 |
Residential mortgages | Level 3 |  |  |
Assets |  |  |
Mortgage servicing rights |  | $ 600 |
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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