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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Long-term Purchase Commitment [Line Items]  
Contractual Obligation, Fiscal Year Maturity Schedule
Year
 
Amount
 
 
(in millions)
2019
 
$
129

2020
 
89

2021
 
78

2022
 
76

2023
 
75

Thereafter
 
444

 
 
$
891

Schedule of Future Minimum Rental Payments for Operating Leases
Year
 
Amount
 
 
(in millions)
2019
 
$
196

2020
 
175

2021
 
152

2022
 
134

2023
 
85

Thereafter
 
235

 
 
$
977