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Other Assets (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Estimated amortization expense for other intangible assets  
Estimated amortization expense, 2014 $ 184
Estimated amortization expense, 2015 164
Estimated amortization expense, 2016 123
Estimated amortization expense, 2017 72
Estimated amortization expense, 2018 $ 61