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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