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Restructuring Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013 Office Consolidation [Member]	Sep. 30, 2014 Employee Related And Other Costs [Member] Canada Divestiture [Member]	Sep. 30, 2014 Employee Related And Other Costs [Member] Canada Divestiture [Member]	Sep. 30, 2014 Accelerated Vesting Of Share-Based Grants For Employees [Member] Canada Divestiture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2	$ 4	$ 44	$ 50		$ 2	$ 44	$ 15
Restructuring costs incurred to date					$ 134

- 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.

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