Investment Securities - Schedule of Cost/Amortized, Unrealized Gains/Losses & FV on AFS Investment Securities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	$ 1,652	$ 1,584
Unrealized Gains	7	13
Unrealized Losses	(72)	(65)
Fair Value	1,587	1,532
U.S. government and government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	13	13
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	13	13
Obligations of states, municipalities, and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	57	59
Unrealized Gains	0	0
Unrealized Losses	(3)	(3)
Fair Value	54	56
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	58	0
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	58	0
Non-U.S. government and government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	139	159
Unrealized Gains	1	1
Unrealized Losses	(3)	(3)
Fair Value	137	157
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	1,088	1,057
Unrealized Gains	5	11
Unrealized Losses	(45)	(38)
Fair Value	1,048	1,030
RMBS
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	207	206
Unrealized Gains	1	1
Unrealized Losses	(18)	(17)
Fair Value	190	190
CMBS
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	20	24
Unrealized Gains	0	0
Unrealized Losses	(2)	(2)
Fair Value	18	22
CDO/ABS
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	70	66
Unrealized Gains	0	0
Unrealized Losses	(1)	(2)
Fair Value	$ 69	$ 64

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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