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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |  |
Securities available for sale | [1] | $ 20,152 | $ 20,157
Loans held for sale, at fair value |  | 1,303 | 497
Mortgage servicing rights |  | 612 |
Derivative assets |  | 300 | 693
Money market mutual fund investments |  | 175 | 165
Other investments |  | 0 | 4
Total equity securities, at fair value |  | 175 | 169
Total assets |  | 22,542 | 21,516
Liabilities |  |  |
Total derivative liabilities |  | 575 | 533
Total liabilities |  | 575 | 533
Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 165 | 538
Liabilities |  |  |
Total derivative liabilities |  | 469 | 379
Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 116 | 148
Liabilities |  |  |
Total derivative liabilities |  | 105 | 149
Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 19 | 7
Liabilities |  |  |
Total derivative liabilities |  | 1 | 5
Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 12 | 12
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 0 | 0
Money market mutual fund investments |  | 175 | 165
Other investments |  | 0 | 0
Total equity securities, at fair value |  | 175 | 165
Total assets |  | 187 | 177
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 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 20,140 | 20,145
Loans held for sale, at fair value |  | 1,303 | 497
Derivative assets |  | 300 | 693
Money market mutual fund investments |  | 0 | 0
Other investments |  | 0 | 4
Total equity securities, at fair value |  | 0 | 4
Total assets |  | 21,743 | 21,339
Liabilities |  |  |
Total derivative liabilities |  | 575 | 533
Total liabilities |  | 575 | 533
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 165 | 538
Liabilities |  |  |
Total derivative liabilities |  | 469 | 379
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 116 | 148
Liabilities |  |  |
Total derivative liabilities |  | 105 | 149
Level 2 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 19 | 7
Liabilities |  |  |
Total derivative liabilities |  | 1 | 5
Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Loans held for sale, at fair value |  | 0 | 0
Derivative assets |  | 0 | 0
Money market mutual fund investments |  | 0 | 0
Other investments |  | 0 | 0
Total equity securities, at fair value |  | 0 | 0
Total assets |  | 612 | 0
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 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 0 | 0
Liabilities |  |  |
Total derivative liabilities |  | 0 | 0
Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale |  | 20,135 | 20,139
Mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 20,135 | 20,139
Mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
State and political subdivisions |  |  |
Assets |  |  |
Securities available for sale |  | 5 | 6
State and political subdivisions | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
State and political subdivisions | Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 5 | 6
State and political subdivisions | Level 3 |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
U.S. Treasury and other |  |  |
Assets |  |  |
Securities available for sale |  | 12 | 12
U.S. Treasury and other | Level 1 |  |  |
Assets |  |  |
Securities available for sale |  | 12 | 12
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 |  | 1,140 | 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 |  | 1,140 | 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 |  | 163 | 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 |  | 163 | 171
Commercial loans held for sale | Level 3 |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | $ 0
Residential mortgages |  |  |
Assets |  |  |
Mortgage servicing rights |  | 612 |
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 |  | $ 612 |
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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