Derivative Instruments and Hedging Activities - Schedule of Fair Value Amounts of Derivative Instruments Reported on our Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	$ 9	$ 0
Derivative contracts in a payable position	3	4
Notional amount	23,181	28,358
Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	8	0
Derivative contracts in a payable position	0	4
Notional amount	21,175	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	2,006	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	394	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	20,992	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	394	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	0	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	29	71
Forwards \| Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Derivative contracts in a receivable position	8	0
Derivative contracts in a payable position	0	4
Notional amount	183	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	29	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	2	0
Notional amount	1,583	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	2	0
Notional amount	$ 1,583	$ 1,381