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New Accounting Pronouncements New Accounting Pronouncements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
New Accounting Pronouncement, Early Adoption [Line Items]    
Reduction in operating expenses $ (750) [1] $ (768) [1]
Income tax expense 149 125
Accounting Standards Update 2014-01 [Member]
   
New Accounting Pronouncement, Early Adoption [Line Items]    
Reduction in operating expenses 21 21
Income tax expense $ 21 $ 21
[1] Expenses for the segments include fully apportioned corporate overhead expenses.