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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |  |
Securities available for sale | [1] | $ 20,157 | $ 20,157
Loans held for sale, at fair value |  | 521 | 497
Derivative assets |  | 357 | 693
Money market mutual fund investments |  | 170 | 165
Other investments |  | 0 | 4
Total equity securities, at fair value |  | 170 | 169
Total assets |  | 21,205 | 21,516
Liabilities |  |  |
Total derivative liabilities |  | 568 | 533
Total liabilities |  | 568 | 533
Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 206 | 538
Liabilities |  |  |
Total derivative liabilities |  | 436 | 379
Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 143 | 148
Liabilities |  |  |
Total derivative liabilities |  | 126 | 149
Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 8 | 7
Liabilities |  |  |
Total derivative liabilities |  | 6 | 5
Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale |  | 20,139 | 20,139
State and political subdivisions |  |  |
Assets |  |  |
Securities available for sale |  | 6 | 6
U.S. Treasury and other |  |  |
Assets |  |  |
Securities available for sale |  | 12 | 12
Residential loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 365 | 326
Commercial loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 156 | 171
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 |  | 170 | 165
Other investments |  | 0 | 0
Total equity securities, at fair value |  | 170 | 165
Total assets |  | 182 | 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 1 | Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Level 1 | State and political subdivisions |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Level 1 | U.S. Treasury and other |  |  |
Assets |  |  |
Securities available for sale |  | 12 | 12
Level 1 | Residential loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Level 1 | Commercial loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Level 2 |  |  |
Assets |  |  |
Securities available for sale |  | 20,145 | 20,145
Loans held for sale, at fair value |  | 521 | 497
Derivative assets |  | 357 | 693
Money market mutual fund investments |  | 0 | 0
Other investments |  | 0 | 4
Total equity securities, at fair value |  | 0 | 4
Total assets |  | 21,023 | 21,339
Liabilities |  |  |
Total derivative liabilities |  | 568 | 533
Total liabilities |  | 568 | 533
Level 2 | Interest rate contracts |  |  |
Assets |  |  |
Derivative assets |  | 206 | 538
Liabilities |  |  |
Total derivative liabilities |  | 436 | 379
Level 2 | Foreign exchange contracts |  |  |
Assets |  |  |
Derivative assets |  | 143 | 148
Liabilities |  |  |
Total derivative liabilities |  | 126 | 149
Level 2 | Other contracts |  |  |
Assets |  |  |
Derivative assets |  | 8 | 7
Liabilities |  |  |
Total derivative liabilities |  | 6 | 5
Level 2 | Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale |  | 20,139 | 20,139
Level 2 | State and political subdivisions |  |  |
Assets |  |  |
Securities available for sale |  | 6 | 6
Level 2 | U.S. Treasury and other |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Level 2 | Residential loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 365 | 326
Level 2 | Commercial loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 156 | 171
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 |  | 0 | 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
Level 3 | Mortgage-backed securities |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Level 3 | State and political subdivisions |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Level 3 | U.S. Treasury and other |  |  |
Assets |  |  |
Securities available for sale |  | 0 | 0
Level 3 | Residential loans held for sale |  |  |
Assets |  |  |
Loans held for sale, at fair value |  | 0 | 0
Level 3 | Commercial loans held for sale |  |  |
Assets |  |  |
Loans held for sale, 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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