Derivatives and Hedging Activities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Total fair value of derivative assets, gross	$ 60	$ 49
Total fair value of derivative liabilities, gross	103	284
Margin on interest rate swaps	8	12
Other Assets
Derivatives, Fair Value [Line Items]
Derivative asset and derivative liability netting, other assets	(20)	(15)
Total derivative assets, net	40	34
Other Assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative assets, gross	35	1
Other Assets | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative assets, gross	0	0
Other Assets | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative assets, gross	35	1
Other Assets | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative assets, gross	25	48
Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative asset and derivative liability netting, other liabilities	(20)	(15)
Total derivative liabilities, net	83	269
Other Liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative liabilities, gross	25	195
Other Liabilities | Interest Rate Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative liabilities, gross	0	0
Other Liabilities | Foreign Exchange Contract | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative liabilities, gross	25	195
Other Liabilities | Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Total fair value of derivative liabilities, gross	$ 78	$ 89