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Goodwill (details) - Total Intangibles (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Other Intangible Assets disclosure    
Intangible assets not subject to amortization $ 217us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill $ 217us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total other intangible assets, gross carrying amount 886us-gaap_IntangibleAssetsGrossExcludingGoodwill 878us-gaap_IntangibleAssetsGrossExcludingGoodwill
Total other intangible assets, accumulated amortization 582us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 527us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total other intangible assets, net $ 304us-gaap_IntangibleAssetsNetExcludingGoodwill $ 351us-gaap_IntangibleAssetsNetExcludingGoodwill