Derivatives and Hedging Activities - Derivatives Summary (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	$ 594	$ 521
Derivatives, gross, liabilities	301	801
Derivative asset and derivative liability netting, assets	(91)	(257)
Derivative asset and derivative liability netting, liabilities	(91)	(257)
Cash collateral netting, assets	(7)	(11)
Cash collateral netting, liabilities	(157)	(212)
Total derivatives assets, net	496	253
Total derivatives liabilities, net	53	332
Other Assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	176	350
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	176	350
Other Assets | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, gross, assets	418	171
Other Liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	238	462
Other Liabilities | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	157	211
Other Liabilities | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	81	251
Other Liabilities | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, gross, liabilities	$ 63	$ 339