Divestitures (Narrative) (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Jul. 24, 2015	Apr. 30, 2016	Mar. 31, 2017
Plainfield
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal, consideration	$ 102
Proceeds from divestiture of interest	29
Amount of consideration received	$ 73
Proceeds from collections on promissory note			$ 6
Civil | One Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures of the business		$ 23
Receivable, net		73
Other assets		3
Accounts payable and accrued liabilities		63
Liability in connection with issuance of a performance guarantee on a contract sold		6
Other Operating Income (Expense) | Civil | One Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business		3
Selling expense		$ 1