Derivatives and Hedging Activities - Derivatives Summary (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	$ 371	$ 80
Derivatives, gross, liabilities	758	977
Derivative asset and derivative liability netting, assets	(234)	(57)
Derivative asset and derivative liability netting, liabilities	(234)	(57)
Cash collateral netting, assets	0	0
Cash collateral netting, liabilities	(30)	(106)
Total derivatives assets, net	137	23
Total derivatives liabilities, net	494	814
Other Assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	186	9
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	186	9
Other Assets | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	185	71
Other Liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	338	554
Other Liabilities | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	19	99
Other Liabilities | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	319	455
Other Liabilities | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	$ 420	$ 423