Derivatives and Hedging Activities (Details Textuals) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative [Line Items]
Derivative asset not offset	$ 0		$ 0
Derivative liabilities not offset	0		0
Margin on interest rate swaps	35,000,000		20,000,000
Cumulative amount of fair value hedging adjustment	64,000,000		(2,000,000)
Net increase in interest expense on long term debt and other	2,000,000	$ 32,000,000
Other Expense [Member]
Derivative [Line Items]
Gain (loss) in changes in fair value of derivatives not designated as hedges	11,000,000	23,000,000
Fair Value Hedging [Member]
Derivative [Line Items]
Notional amount of long-term debt	6,800,000,000		8,800,000,000
Net Investment Hedges [Member]
Derivative [Line Items]
Notional amounts of derivatives	2,900,000,000		3,000,000,000.0
Reported Value Measurement [Member]
Derivative [Line Items]
Notional amount of long-term debt	6,800,000,000		$ 8,700,000,000
Foreign Currency Translation Adjustment Gains (Losses) [Member]
Derivative [Line Items]
Gain (loss) on net investment hedges, net of taxes	$ 346,000,000	$ (57,000,000)