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Intangibles (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Intangibles    
Intangible assets, gross $ 808 $ 781
Intangible assets, accumulated amortization 329 291
Intangible liabilities, gross 209 207
Intangible liabilities, accumulated amortization $ 121 $ 108