Derivatives and Hedging Activities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	$ 43	$ 277
Total derivative liabilities, gross	226	16
Derivative asset netting	(27)	(11)
Derivative liability netting	(27)	(11)
Total derivatives assets, net	16	266
Total derivatives liabilities, net	199	5
Margin on interest rate swap not netted	20	55
Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	12	57
Other Assets [Member] | Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	0	0
Other Assets [Member] | Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	12	57
Other Assets [Member] | Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	31	220
Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	44	10
Other Liabilities [Member] | Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	0	0
Other Liabilities [Member] | Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	44	10
Other Liabilities [Member] | Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivative liabilities, gross	$ 182	$ 6