Supplementary Financial Information Supplemental Financial Information (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Accounts receivable	$ 628	$ 677
Allowance for doubtful accounts	(3)	(6)
Accounts receivable, net	625	671
Foreign Exchange Contracts	23	7
Other	41	63
Prepaid expenses and other current assets	64	70
Accrued incentive compensation	52	68
Customer reserves	50	38
Accrued payroll	51	49
Interest payable	20	36
Accrued other expenses	150	176
Total accrued liabilities	$ 323	$ 367