Derivatives and Hedging Activities (Details Textuals) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative [Line Items]
Derivatives subject to master netting arrangements not offset	$ 0		$ 0
Margin on interest rate swaps	80,000,000		47,000,000
Cumulative amount of fair value hedging adjustment	814,000,000		217,000,000
Net increase (reduction) in interest expense on long term debt and other	(21,000,000)	$ 38,000,000
Other Expense [Member]
Derivative [Line Items]
Gain (loss) in changes in fair value of derivatives not designated as hedges	20,000,000	4,000,000
Fair Value Hedging [Member] | Fixed-Rate Debt Obligations [Member]
Derivative [Line Items]
Notional amount of long-term debt	20,600,000,000		22,600,000,000
Net Investment Hedges [Member]
Derivative [Line Items]
Notional amounts of derivatives	10,000,000,000.0		9,800,000,000
Reported Value Measurement [Member]
Derivative [Line Items]
Notional amount of long-term debt	21,300,000,000		$ 22,700,000,000
Accumulated Other Comprehensive Loss [Member]
Derivative [Line Items]
Gain (loss) on net investment hedges, net of taxes	$ 732,000,000	$ (162,000,000)