Revenue (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales and operating revenues		$ 2,537	$ 2,317	$ 5,111	$ 4,609
Cost of sales (exclusive of depreciation and amortization shown below)		2,159	1,949	4,357	3,878
Inventory	$ 864	898		898		$ 869
Prepayments and other (including contract assets)	297	348		348		291
Accrued Liabilities		326		326
Retained earnings (accumulated deficit)	(947)	(864)		(864)		(946)
Increase in inventories		19	15	53	60
Increase in prepayments and other current assets		(25)	(11)	(70)	(68)
Increase in other current liabilities		33	$ 160	30	$ 152
Calculated under Revenue Guidance in Effect before Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales and operating revenues		2,537		5,109
Cost of sales (exclusive of depreciation and amortization shown below)		2,159		4,355
Inventory		906		906		869
Prepayments and other (including contract assets)		328		328		291
Accrued Liabilities		315		315
Retained earnings (accumulated deficit)		(865)		(865)		$ (946)
Increase in inventories		27		61
Increase in prepayments and other current assets		5		(50)
Increase in other current liabilities		22		19
Adjustments Due to ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings	1			1
Adjustments Due to ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales and operating revenues		0		2
Cost of sales (exclusive of depreciation and amortization shown below)		0		2
Inventory	(5)	(8)		(8)
Prepayments and other (including contract assets)	6	20		20
Accrued Liabilities		11		11
Retained earnings (accumulated deficit)	1	1		1
Increase in inventories		(8)		(8)
Increase in prepayments and other current assets		20		20
Increase in other current liabilities		11		11
Adjustments Due to ASU 2016-16 (a)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings				(2)
Inventory	0
Prepayments and other (including contract assets)	0
Retained earnings (accumulated deficit)	$ (2)
Transferred over Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue recognized		$ 1		$ 2