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Intangibles (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Intangibles    
Intangible assets, gross $ 796 $ 781
Intangible assets, accumulated amortization 318 291
Intangible liabilities, gross 207 207
Intangible liabilities, accumulated amortization $ 117 $ 108