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Securitizations and Variable Interest Entities - Schedule of Cost and Fair Value of Securities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Amortized Cost	$ 491	$ 460
Fair Value	486	464
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Fair Value	486	464
Rated notes | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Amortized Cost	370	356
Fair Value	372	355
Certificates and other assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Amortized Cost	121	104
Fair Value	$ 114	$ 109

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Amortized cost 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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