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INVESTMENT SECURITIES - Securities Classified as Current and Long-Term (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | $ 18,485 | $ 18,302
Gross Unrealized Gains | 27 | 34
Gross Unrealized Losses | (1,435) | (1,328)
Fair Value | 17,077 | 17,008
U.S. Treasury and agency obligations |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 2,928 | 2,717
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (84) | (51)
Fair Value | 2,844 | 2,667
Mortgage-backed securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 3,925 | 3,946
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (486) | (425)
Fair Value | 3,439 | 3,522
Tax-exempt municipal securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 850 | 879
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (24) | (22)
Fair Value | 826 | 858
Residential |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 462 | 465
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (68) | (66)
Fair Value | 394 | 400
Commercial |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 1,420 | 1,471
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (113) | (126)
Fair Value | 1,308 | 1,345
Asset-backed securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 1,552 | 1,813
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | (37) | (44)
Fair Value | 1,517 | 1,771
Corporate debt securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 7,348 | 7,011
Gross Unrealized Gains | 24 | 28
Gross Unrealized Losses | (623) | (594)
Fair Value | $ 6,749 | $ 6,445

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