FAIR VALUE MEASUREMENTS - Assets and Liabilities on Recurring Basis (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | $ 3,126 | $ 3,463 |
Loans held for sale | [1] | 159 | 144 |
Derivative assets | | 252 | 376 |
Derivative liabilities | | 41 | 40 |
U.S. Treasury [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | | 600 |
US Government Agencies [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 167 | 172 |
U.S. Government-Sponsored Entities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 160 | 161 |
Agency Collateralized Mortgage Obligations [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 1,226 | 1,124 |
Commercial Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 322 | 378 |
States of the U.S. and Political Subdivisions (municipals) [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 33 | 32 |
Other Debt Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 2 | 2 |
Level 1 [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 600 |
Derivative assets | | 0 | 0 |
Derivative liabilities | | 0 | 0 |
Level 2 [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 3,126 | 2,863 |
Derivative assets | | 238 | 352 |
Derivative liabilities | | 41 | 40 |
Level 3 [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Derivative assets | | 14 | 24 |
Derivative liabilities | | 0 | 0 |
Fair Value, Recurring [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 3,126 | 3,463 |
Loans held for sale | | 159 | 144 |
Derivative assets | | 252 | 376 |
Total assets measured at fair value on a recurring basis | | 3,537 | 3,983 |
Derivative liabilities | | 41 | 40 |
Total liabilities measured at fair value on a recurring basis | | 41 | 40 |
Fair Value, Recurring [Member] | U.S. Treasury [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | | 600 |
Fair Value, Recurring [Member] | US Government Agencies [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 167 | 172 |
Fair Value, Recurring [Member] | U.S. Government-Sponsored Entities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 160 | 161 |
Fair Value, Recurring [Member] | Agency Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 1,216 | 994 |
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 1,226 | 1,124 |
Fair Value, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 322 | 378 |
Fair Value, Recurring [Member] | States of the U.S. and Political Subdivisions (municipals) [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 33 | 32 |
Fair Value, Recurring [Member] | Other Debt Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 2 | 2 |
Fair Value, Recurring [Member] | Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 39 | 37 |
Fair Value, Recurring [Member] | Not for Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 2 | 3 |
Fair Value, Recurring [Member] | Trading Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | 236 | 349 |
Fair Value, Recurring [Member] | Non Trading Account Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | 16 | 27 |
Fair Value, Recurring [Member] | Level 1 [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 600 |
Loans held for sale | | 0 | 0 |
Derivative assets | | 0 | 0 |
Total assets measured at fair value on a recurring basis | | 0 | 600 |
Derivative liabilities | | 0 | 0 |
Total liabilities measured at fair value on a recurring basis | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | U.S. Treasury [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | | 600 |
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Agencies [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | U.S. Government-Sponsored Entities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Agency Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Agency Collateralized Mortgage Obligations [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | States of the U.S. and Political Subdivisions (municipals) [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Other Debt Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Not for Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Trading Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | 0 | 0 |
Fair Value, Recurring [Member] | Level 1 [Member] | Non Trading Account Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | 0 | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 3,126 | 2,863 |
Loans held for sale | | 159 | 144 |
Derivative assets | | 238 | 352 |
Total assets measured at fair value on a recurring basis | | 3,523 | 3,359 |
Derivative liabilities | | 41 | 40 |
Total liabilities measured at fair value on a recurring basis | | 41 | 40 |
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. Treasury [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | | 0 |
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Agencies [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 167 | 172 |
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. Government-Sponsored Entities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 160 | 161 |
Fair Value, Recurring [Member] | Level 2 [Member] | Agency Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 1,216 | 994 |
Fair Value, Recurring [Member] | Level 2 [Member] | Agency Collateralized Mortgage Obligations [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 1,226 | 1,124 |
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 322 | 378 |
Fair Value, Recurring [Member] | Level 2 [Member] | States of the U.S. and Political Subdivisions (municipals) [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 33 | 32 |
Fair Value, Recurring [Member] | Level 2 [Member] | Other Debt Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 2 | 2 |
Fair Value, Recurring [Member] | Level 2 [Member] | Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 39 | 37 |
Fair Value, Recurring [Member] | Level 2 [Member] | Not for Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 2 | 3 |
Fair Value, Recurring [Member] | Level 2 [Member] | Trading Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | 236 | 349 |
Fair Value, Recurring [Member] | Level 2 [Member] | Non Trading Account Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | 2 | 3 |
Fair Value, Recurring [Member] | Level 3 [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Loans held for sale | | 0 | 0 |
Derivative assets | | 14 | 24 |
Total assets measured at fair value on a recurring basis | | 14 | 24 |
Derivative liabilities | | 0 | 0 |
Total liabilities measured at fair value on a recurring basis | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | U.S. Treasury [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Agencies [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | U.S. Government-Sponsored Entities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Agency Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Agency Collateralized Mortgage Obligations [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage-Backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | States of the U.S. and Political Subdivisions (municipals) [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Other Debt Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities, available for sale | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Not for Trading Liabilities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liabilities | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Trading Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | 0 | 0 |
Fair Value, Recurring [Member] | Level 3 [Member] | Non Trading Account Assets [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets | | $ 14 | $ 24 |
| |
[1] | Amount represents loans for which we have elected the fair value option. See Note 18. | |