Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies [Abstract]

Future Minimum Payments under Non-Cancelable Operating Leases

The following table presents future minimum payments under non-cancelable operating leases with initial or remaining terms in excess of one year at December 31, 2017.

	Real Estate			Equipment		Total
	(in millions)
2018	$	101		$	5	$	106
2019		81			3		84
2020		106			2		108
2021		60			—		60
2022		57			—		57
Thereafter		236			—		236
Total minimum payments required		641			10		651
Sublease rentals under non-cancelable leases		(9	)		—		(9	)
Net minimum payments required	$	632		$	10	$	642