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INVESTMENT SECURITIES - Schedule of Investment Securities Classified as Current and Long-Term (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	$ 19,114	$ 20,018
Gross Unrealized Gains	52	26
Gross Unrealized Losses	(1,067)	(1,409)
Fair Value	18,099	18,635
U.S. Treasury and agency obligations
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	3,104	3,336
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(49)	(110)
Fair Value	3,058	3,227
Mortgage-backed securities
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	4,434	4,504
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(421)	(509)
Fair Value	4,017	3,995
Tax-exempt municipal securities
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	488	548
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(24)	(22)
Fair Value	464	526
Residential
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	589	586
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(54)	(64)
Fair Value	536	522
Commercial
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	1,113	1,290
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(61)	(85)
Fair Value	1,053	1,206
Asset-backed securities
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	1,271	1,424
Gross Unrealized Gains	6	3
Gross Unrealized Losses	(16)	(24)
Fair Value	1,261	1,403
Corporate debt securities
Investment Securities, Available-for-sale Amortized Cost to Fair Value
Amortized Cost	8,115	8,330
Gross Unrealized Gains	37	21
Gross Unrealized Losses	(442)	(595)
Fair Value	$ 7,710	$ 7,756

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