Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Commitment and Contingencies [Line Items]
Rent expense	$ 10	$ 28
Operating lease right of use assets obtained in exchange for lease obligations		30
Operating lease payments for the remainder of 2019	7	7
2020	27	27
2021	26	26
2022	24	24
2023	20	20
Thereafter	$ 83	$ 83
Weighted average discount rate	4.50%	4.50%
Weighted average remaining lease term	8 years	8 years
Imputed interest	$ 30	$ 30
Estimate of possible loss	55	55
Loss accrual	19	19
Indirect tax contingency	11	11
Parent Company [Member] | Euro Medium Term Notes [Member] | Senior Notes [Member]
Commitment and Contingencies [Line Items]
Debt instrument, face amount	1,100	1,100	$ 1,100
Other Assets [Member]
Commitment and Contingencies [Line Items]
Operating lease right-of-use assets	135	135
Other Liabilities [Member]
Commitment and Contingencies [Line Items]
Operating lease liabilities	$ 157	$ 157