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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Cash distributions $ 4,000 $ 3,750 $ 3,500
Revenue from Related Parties 150 50 41
Related Party Transaction Expenditures From Transactions with Affiliates 20 23 15
Parent Company
     
Related Party Transaction [Line Items]      
Cash distributions 4,000 3,750  
Tax refund from parent company 8 0  
Tax payments to parent company $ 1,560 $ 1,033