Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments for Noncancelable Operating Leases

As of December 31, 2017, future minimum lease payments under these non-cancelable operating agreements are as follows (in millions):

2018	$	78
2019	75
2020	72
2021	71
2022	63
Thereafter	162
Total	$	521