Derivatives and Hedging Activities (Details 1) - Interest Rate Contracts [Member] - Fair Value Hedging [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fixed-rate long-term debt			$ 206
Derivatives designated as hedging instruments			(246)
Total			$ (40)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fixed-rate long-term debt	$ (458)	$ 59
Derivatives designated as hedging instruments	462	(43)
Total	$ 4	$ 16