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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Contract assets	$ 177,000,000	$ 177,000,000	$ 0		$ 191,000,000
Contract with Customer, Asset, Net, Noncurrent	7,000,000	7,000,000			2,000,000
Contract with Customer, Liability, Current	112,000,000	112,000,000			128,000,000
Contract with Customer, Liability, Noncurrent	32,000,000	32,000,000	54,000,000		46,000,000
Contract with Customer, Asset, Net	40,000,000	40,000,000			19,000,000
Accounts Receivable, Net, Current	782,000,000	782,000,000	1,114,000,000		908,000,000
Revenue from Contract with Customer, Excluding Assessed Tax		5,393,000,000
Capitalized Contract Cost, Amortization		50,000,000
Reclassification of amounts impacted by Tax Reform		(5,000,000)
Restricted Cash, Current	9,000,000	9,000,000	9,000,000	$ 26,000,000
Retained earnings (deficit)	(233,000,000)	(233,000,000)	171,000,000
Revenues		5,393,000,000	6,022,000,000	6,408,000,000
Revenue Recognition, Milestone Method, Revenue Recognized		134,000,000
Asset Impairment Charges		0
Corporate allocations				$ 165,000,000
Assets held for sale	15,000,000	15,000,000	757,000,000
Liabilities held for sale	40,000,000	40,000,000	$ 169,000,000
Deferred Sales Commission	24,000,000	24,000,000
Deferred Sales Inducement Cost, Net	23,000,000	23,000,000
Deferred Set-up Costs, Noncurrent	53,000,000	53,000,000
Retained Earnings [Member]
Reclassification of amounts impacted by Tax Reform	$ 5,000,000	5,000,000
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Contract assets					7,000,000
Deferred Tax Assets, Tax Deferred Expense					5,000,000
Contract with Customer, Liability, Current					(9,000,000)
Contract with Customer, Liability, Noncurrent					(6,000,000)
Retained earnings (deficit)					$ 17,000,000
Revenues		$ 150,000,000

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