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Restructuring Costs (Schedule Of The Components Of Restructuring Costs Included In The Comprehensive Consolidated Statements Of Earnings) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 46us-gaap_RestructuringCharges	$ 54us-gaap_RestructuringCharges	$ 74us-gaap_RestructuringCharges
Employee Severance And Retention [Member] \| Canadian Divestitures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	42
Employee Severance And Retention [Member] \| Office Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		13	77
Employee Severance And Retention [Member] \| Offshore Divestiture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs			(3)
Lease Obligations And Other [Member] \| Canadian Divestitures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	4
Lease Obligations And Other [Member] \| Office Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		41	3
Lease Obligations And Other [Member] \| Offshore Divestiture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs			$ (3)

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details