Derivatives and Hedging Activities 1 (Details) - Interest Rate Contracts [Member] - Fair Value Hedging [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fixed-rate long-term debt	$ (181)	$ 29
Derivatives designated as hedging instruments	184	(13)
Total	$ 3	$ 16
Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fixed-rate long-term debt			$ 100
Derivatives designated as hedging instruments			(129)
Total			$ (29)