Contingencies and Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of minimum rental payments for operating leases

Future minimum rental payments for operating leases having non-cancellable terms in excess of one year are as follows (in millions).

2018	2019	2020	2021	2022	After     2022	Total
$1,330	$1,192	$1,067	$872	$709	$3,316	$8,486