Derivatives and Hedging Activities - Derivatives Summary (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	$ 141	$ 1,006
Derivatives, gross, liabilities	1,206	131
Derivative asset and derivative liability netting, assets	(118)	(91)
Derivative asset and derivative liability netting, liabilities	(118)	(91)
Cash collateral netting, assets	0	(18)
Cash collateral netting, liabilities	(60)	(23)
Total derivatives assets, net	23	897
Total derivatives liabilities, net	1,028	17
Other Assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	21	340
Other Assets | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	0	0
Other Assets | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	21	340
Other Assets | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	120	666
Other Liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	731	41
Other Liabilities | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	13	23
Other Liabilities | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	718	18
Other Liabilities | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	$ 475	$ 90