Derivatives and Hedging Activities - Derivatives Summary (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	$ 564	$ 174
Derivatives, gross, liabilities	149	1,120
Derivative asset and derivative liability netting, assets	(117)	(151)
Derivative asset and derivative liability netting, liabilities	(117)	(151)
Cash collateral netting, assets	(21)	(1)
Cash collateral netting, liabilities	0	(9)
Total derivatives assets, net	426	22
Total derivatives liabilities, net	33	961
Balance Sheet Location [Axis]: us-gaap:OtherAssets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	167	26
Balance Sheet Location [Axis]: us-gaap:OtherAssets | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	0	0
Balance Sheet Location [Axis]: us-gaap:OtherAssets | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	167	26
Balance Sheet Location [Axis]: us-gaap:OtherAssets | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	397	148
Balance Sheet Location [Axis]: us-gaap:OtherLiabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	44	702
Balance Sheet Location [Axis]: us-gaap:OtherLiabilities | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	0	4
Balance Sheet Location [Axis]: us-gaap:OtherLiabilities | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	44	699
Balance Sheet Location [Axis]: us-gaap:OtherLiabilities | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	$ 105	$ 418