Derivatives - Cumulative Basis Adjustment on Fair Value Hedges (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Cumulative Basis Adjustments Due to Fair Value Hedging [Line Items]
Carrying amount debt hedged liability	$ (68,285)	$ (107,241)
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Long-term Debt Carrying Amount, Short-term Debt	Long-term Debt Carrying Amount, Short-term Debt
Total basis adjustment cumulative amount for hedged liability	$ 2,054	$ 4,050
Hedged Asset, Fair Value Hedge, Last-of-Layer, Cumulative Increase (Decrease)	(300)	(700)
Basis adjustment amount for hedged liability - discontinued hedge	15	19
Mortgage loans held-for-investment
Cumulative Basis Adjustments Due to Fair Value Hedging [Line Items]
Carrying amount mortgage loans hedged asset	$ 1,084,479	$ 1,117,060
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Mortgage Loans held-for-investment, net	Mortgage Loans held-for-investment, net
Hedged Asset, Fair Value Hedge, Portfolio Layer, Cumulative Increase (Decrease)	$ (2,768)	$ (3,909)
Hedged Asset, Fair Value Hedge, Last-of-Layer, Cumulative Increase (Decrease)	(330)	(695)
Basis adjustment amount for hedged asset - discontinued hedge	(2,438)	(3,214)
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost	44,826	56,394
Hedged Asset, Fair Value Hedge, Last-of-Layer, Amount	$ 8,585	$ 12,070