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Company Transformation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Components of transformation costs    
Non-cash asset impairment $ 0 $ 55
Advisory fees 7 22
Lease termination and other real estate costs 0 3
Other costs 5 5
Transformation costs before income tax benefit 12 85
Tax benefit (2) (22)
Total transformation costs, net of tax benefit 10 63
Continuing Operations [Member]
    
Components of transformation costs    
Non-cash asset impairment 0 55
Advisory fees 1 0
Lease termination and other real estate costs 0 3
Other costs 4 2
Transformation costs before income tax benefit 5 60
Tax benefit (1) (20)
Total transformation costs, net of tax benefit 4 40
Discontinued Operations [Member]
    
Components of transformation costs    
Non-cash asset impairment 0 0
Advisory fees 6 22
Lease termination and other real estate costs 0 0
Other costs 1 3
Transformation costs before income tax benefit 7 25
Tax benefit (1) (2)
Total transformation costs, net of tax benefit $ 6 $ 23