Divestitures (Narrative) (Details) - USD ($) $ in Millions			1 Months Ended	3 Months Ended
	Apr. 15, 2016	Jul. 24, 2015	Jan. 30, 2015	Jul. 03, 2015	Jul. 01, 2016	Jan. 01, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts payable and accrued liabilities					$ 720	$ 769
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Plainfield
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration received		$ 29
Aggregate consideration		102
Note receivable		$ 73
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Plainfield
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership (in percentage)							100.00%
Health and Infrastructure Sector | Disposal Group, Disposed of by Sale, Not Discontinued Operations | One Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 23
Receivable, net	73
Other assets	3
Accounts payable and accrued liabilities	63
Maximum earn-out payment	2
Accounts payable and accrued liabilities	6
Health and Infrastructure Sector | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Plainfield
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets			$ 40	$ 29
Other Operating Income (Expense) | Health and Infrastructure Sector | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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