Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Details 4)

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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt $ 22,615us-gaap_LongTermDebt $ 20,178us-gaap_LongTermDebt
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value $ 23,411us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
$ 20,352us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member