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Table - Long-Term Debt Maturities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long-Term Debt Disclosure [Abstract]    
2015 $ 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 2,003us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 4,590us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total 6,641us-gaap_LongTermDebtNoncurrent 3,310us-gaap_LongTermDebtNoncurrent
Debt Instrument, Unamortized Premium 67us-gaap_DebtInstrumentUnamortizedPremium  
Debt Instrument, Unamortized Discount (19)us-gaap_DebtInstrumentUnamortizedDiscount  
Long-term Debt $ 6,593us-gaap_LongTermDebt [1]  
[1] *Excludes a $67 million unamortized premium on the 2020 PVR Notes and the 2021 PVR Notes assumed by the Partnership and a $19 million unamortized discount on the combined 2022 Notes.