Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of future minimum lease payments

Future minimum lease payments by year and in the aggregate under all operating leases and lease financing obligations consist of the following approximate amounts:

	Lease Financing Obligations		Operating Leases		Total
	(In millions)
2016	$	15	$	49	$	64
2017	16		47		63
2018	16		41		57
2019	16		32		48
2020	17		24		41
Thereafter	323		39		362
	$	403	$	232	$	635