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, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
receivable position	$ 1	$ 12
payable position	7	4
Notional amount	35,813	40,508
Credit derivative, maximum exposure, undiscounted	6	10
Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	1	10
payable position	3	0
Notional amount	35,245	39,620
Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	2
payable position	4	4
Notional amount	568	888
Interest rate contracts | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	0	172
Swaps | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	28,907	33,300
Purchased options | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	1	2
payable position	0	0
Notional amount	6,150	6,150
Forwards | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	0	109
Written options | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	0	63
Foreign exchange contracts | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	37	47
Forwards | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	8
payable position	3	0
Notional amount	188	170
Forwards | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	37	47
Total credit risk | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	4	4
Notional amount	531	669
Credit-linked note derivatives | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	531	669
Other credit derivatives | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	$ 4	$ 4