Derivatives and Hedging Activities - Derivatives Summary (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	$ 80	$ 521
Total derivative liabilities, gross	977	801
Derivative asset and derivative liability netting, assets	(57)	(257)
Derivative asset and derivative liability netting, liabilities	(57)	(257)
Cash collateral netting, assets	0	(11)
Cash collateral netting, liabilities	(106)	(212)
Total derivatives assets, net	23	253
Total derivatives liabilities, net	$ 814	$ 332
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Other Assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	$ 9	$ 350
Other Assets | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	0	0
Other Assets | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	9	350
Other Assets | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	71	171
Other Liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	554	462
Other Liabilities | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	99	211
Other Liabilities | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	455	251
Other Liabilities | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	$ 423	$ 339