Contingencies and Commitments (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Total rent expense	$ 151,000,000	$ 142,000,000	$ 151,000,000
Weighted average remaining lease term	22 years
Weighted average lease discount rate	4.00%
Commitments related to agreements with certain cobrand partners	$ 5,000,000,000
Minimum [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	0
Maximum [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 190,000,000