Accounts Receivable, Net (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Net		$ 1,037		$ 1,037		$ 961
Accounts Receivable Sales Arrangements [Abstract]
Uncollected accounts receivable sold and derecognized		548		548		531
Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Invoiced		713		713		651
Accrued		380		380		374
Allowance for doubtful accounts		(56)		(56)		(64)
Accounts receivable sales		567	$ 582	1,078	$ 1,174
Deferred proceeds		56	59	108	130
Loss on sales of accounts receivable		3	4	6	8
Estimated increase (decrease) to operating cash flows(1)	[1]	54	$ (11)	(11)	$ 15
Other Current Assets [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred purchase price receivable		$ 57		$ 57		$ 48

[1] Represents the difference between current and prior period receivable sales adjusted for the effects of: (i) the deferred proceeds, (ii) collections prior to the end of the quarter and, (iii) currency.