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Risk Management Activities and Fair Value Measurements - Fair Value (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Jun. 30, 2012
Fair Value, Inputs, Level 1 [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded & not recorded at fair value $ 23,954 $ 25,829
Fair Value, Inputs, Level 1 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Investment securities 15 9
Total assets recorded at fair value 15 [1] 9 [1]
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded at fair value 0 [2] 0 [2]
Fair Value, Inputs, Level 1 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt, Fair Value 23,954 [3] 25,829
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 [4] 0 [4]
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 [4] 0 [4]
Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Fair Value, Inputs, Level 1 [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 0
Fair Value, Inputs, Level 2 [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded & not recorded at fair value 3,100 2,305
Fair Value, Inputs, Level 2 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Investment securities 0 0
Total assets recorded at fair value 594 [1] 419 [1]
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded at fair value 89 [2] 186 [2]
Fair Value, Inputs, Level 2 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt, Fair Value 3,011 [3] 2,119 [3]
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 63 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 142
Fair Value, Inputs, Level 2 [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 68 [4] 86 [4]
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 87 [4] 23 [4]
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 323 298
Fair Value, Inputs, Level 2 [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 140 32
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 1 19
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 3
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 1 2
Fair Value, Inputs, Level 3 [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded & not recorded at fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Investment securities 25 24
Total assets recorded at fair value 25 [1] 24 [1]
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded at fair value 0 [2] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt, Fair Value 0 [3] 0 [3]
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 0
Fair Value, Inputs, Level 3 [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 [4] 0 [4]
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 [4] 0 [4]
Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Fair Value, Inputs, Level 3 [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 0
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 0
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded & not recorded at fair value 27,054 28,134
Estimate of Fair Value, Fair Value Disclosure [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Investment securities 40 33
Total assets recorded at fair value 634 [1] 452 [1]
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities recorded at fair value 89 [2] 186 [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Portion at Other than Fair Value, Fair Value Disclosure [Member]
    
Liabilities, Fair Value Disclosure [Abstract]    
Long-term Debt, Fair Value 26,965 [3] 27,948 [3]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Exchange Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 63 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 142
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Foreign Currency Instruments [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 68 [4] 86 [4]
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 87 [4] 23 [4]
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 323 298
Estimate of Fair Value, Fair Value Disclosure [Member] | Net Investment Hedging [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 140 32
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 1 19
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity Contract [Member] | Portion at Fair Value, Fair Value Disclosure [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 0 3
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities $ 1 $ 2
[1] Investment securities are presented in other noncurrent assets and all derivative assets are presented in prepaid expenses and other current assets or other noncurrent assets.
[2] All liabilities are presented in accrued and other liabilities or other noncurrent liabilities.
[3] Long-term debt includes the current portion ($522 and $4,095 as of December 31 and June 30, 2012, respectively) of debt instruments. Long term debt is not recorded at fair value on a recurring basis, but is measured at fair value for disclosure purposes. Fair values are generally estimated based on quoted market prices for identical or similar instruments.
[4] Other foreign currency instruments are comprised of foreign currency financial instruments that do not qualify as hedges.