Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Commitment and Contingencies [Line Items]
Rent expense	$ 13	$ 18
Operating lease right of use assets obtained in exchange for lease obligations		27
Operating lease payments for the remainder of 2019	14	14
2020	27	27
2021	26	26
2022	24	24
2023	20	20
Thereafter	$ 78	$ 78
Weighted average discount rate	4.40%	4.40%
Weighted average remaining lease term	8 years	8 years
Estimate of possible loss	$ 67	$ 67
Loss accrual	23	23
Indirect tax contingency	14	14
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	138	138
Other Liabilities [Member]
Commitment and Contingencies [Line Items]
Operating lease liabilities	$ 159	$ 159