Derivative Instruments and Hedging Activities - Schedule of Fair Value Amounts of Derivative Instruments Reported on our Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	$ 3	$ 0
Derivative contracts in a payable position	3	4
Notional amount	26,419	28,358
Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	2	0
Derivative contracts in a payable position	0	4
Notional amount	24,944	26,906
Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	1	0
Derivative contracts in a payable position	3	0
Notional amount	1,475	1,452
Interest rate \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	1	0
Derivative contracts in a payable position	1	0
Notional amount	216	0
Swaps \| Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	0	0
Notional amount	22,507	23,257
Swaps \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	1	0
Derivative contracts in a payable position	1	0
Notional amount	216	0
Purchased options \| Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	0	0
Notional amount	2,250	3,450
Foreign exchange \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	0	0
Notional amount	35	71
Forwards \| Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	2	0
Derivative contracts in a payable position	0	4
Notional amount	187	199
Forwards \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	0	0
Notional amount	35	71
Total credit risk \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	1	0
Notional amount	1,224	1,381
Credit-linked note derivatives \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	1	0
Notional amount	1,224	1,381
Equity \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	1	0
Notional amount	0	0
Written options \| Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	0	0
Derivative contracts in a payable position	1	0
Notional amount	$ 0	$ 0