Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Contractual Maturities (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Contractual Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost $ 316 $ 186
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 311 185
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 979 1,057
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 970 1,039
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 1,847 1,838
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 1,843 1,802
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost 10,526 11,027
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 10,571 10,754
Debt Securities, Available-for-sale, Amortized Cost 13,668 14,108
Debt Securities, Available-for-sale 13,695 13,780
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 0 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 0 0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 20 11
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 20 11
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 338 362
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 342 356
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost 8,346 8,192
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 8,386 7,919
Debt Securities, Held-to-maturity 8,704 8,565
Debt Securities, Held-to-maturity, Fair Value $ 8,748 $ 8,286