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INVESTMENT SECURITIES - Securities Classified as Current and Long-Term (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | $ 16,747 | $ 15,946
Gross Unrealized Gains | 35 | 9
Gross Unrealized Losses | (1,479) | (1,701)
Fair Value | 15,303 | 14,254
Common stock | 0 | 7
Total investment securities | 15,303 | 14,261
U.S. Treasury and agency obligations |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 1,394 | 1,093
Gross Unrealized Gains | 9 | 1
Gross Unrealized Losses | (47) | (55)
Fair Value | 1,356 | 1,039
Mortgage-backed securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 3,919 | 3,697
Gross Unrealized Gains | 7 | 4
Gross Unrealized Losses | (423) | (471)
Fair Value | 3,503 | 3,230
Tax-exempt municipal securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 762 | 765
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (27) | (37)
Fair Value | 736 | 728
Residential |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 470 | 477
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (73) | (76)
Fair Value | 397 | 401
Commercial |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 1,562 | 1,554
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (149) | (155)
Fair Value | 1,413 | 1,399
Asset-backed securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 1,915 | 1,809
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (64) | (79)
Fair Value | 1,853 | 1,731
Corporate debt securities |  |
Investment Securities, Available-for-sale Amortized Cost to Fair Value |  |
Amortized Cost | 6,725 | 6,551
Gross Unrealized Gains | 16 | 3
Gross Unrealized Losses | (696) | (828)
Fair Value | $ 6,045 | $ 5,726

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