Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future minimum rentals for leases having initial or remaining noncancelable lease terms in excess of one year

As of December 31, 2017, our future minimum rentals for leases having initial or remaining noncancelable lease terms in excess of one year were as follows (in millions):

2018	$	359
2019	236
2020	148
2021	104
2022	74
Thereafter	366
Total minimum rental payments	$	1,287
Minimum rentals to be received under subleases	$	15

Rental expense for all operating leases

Rental expense, net of sublease rental income” was as follows (in millions):

	Year Ended December 31,
	2017		2016		2015
Minimum rental expense	$	691	$	739	$	732
Contingent rental expense	21		70		105
Total rental expense	712		809		837
Less sublease rental income	54		31		46
Rental expense, net of sublease rental income	$	658	$	778	$	791