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Derivative Instruments and Hedging Activities - Part 2 (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets    
Derivative Assets Current $ 14 $ 49
Derivative Assets Noncurrent 86 71
Total assets 100 120
Liabilities    
Derivative Liabilities Current 186 153
Total noncurrent derivative liabilities 471 537
Total liabilities 657 690
Designated as Hedging Instruments
    
Assets    
Total assets 8 16
Liabilities    
Total liabilities 565 558
Not Designated as Hedging Instruments
    
Assets    
Total assets 92 104
Liabilities    
Total liabilities 92 132
No longer carried at fair value [Member]
    
Assets    
Total assets (186) (163)
Liabilities    
Total liabilities (191)  
Interest Rate Derivatives
    
Assets    
Total assets 2 0
Liabilities    
Total liabilities 565 559
Interest Rate Derivatives | Level 1
    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Interest Rate Derivatives | Level 2
    
Assets    
Total assets 2 0
Liabilities    
Total liabilities 153 431
Interest Rate Derivatives | Level 3
    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 412 128
Interest Rate Derivatives | Designated as Hedging Instruments
    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 544 535
Interest Rate Derivatives | Not Designated as Hedging Instruments
    
Assets    
Total assets 2 0
Liabilities    
Total liabilities 21 24
Cross Currency Swaps
    
Assets    
Total assets 6 1
Liabilities    
Total liabilities 6 19
Cross Currency Swaps | Level 1
    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Cross Currency Swaps | Level 2
    
Assets    
Total assets 6 0
Liabilities    
Total liabilities 6 0
Cross Currency Swaps | Level 3
    
Assets    
Total assets 0 1
Liabilities    
Total liabilities 0 19
Cross Currency Swaps | Designated as Hedging Instruments
    
Assets    
Total assets 6 1
Liabilities    
Total liabilities 6 19
Cross Currency Swaps | Not Designated as Hedging Instruments
    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Foreign Currency Options and Forwards
    
Assets    
Total assets 81 89
Liabilities    
Total liabilities 14 26
Foreign Currency Options and Forwards | Level 1
    
Assets    
Total assets 0 0
Liabilities    
Total liabilities 0 0
Foreign Currency Options and Forwards | Level 2
    
Assets    
Total assets 2 27
Liabilities    
Total liabilities 7 15
Foreign Currency Options and Forwards | Level 3
    
Assets    
Total assets 79 62
Liabilities    
Total liabilities 7 11
Foreign Currency Options and Forwards | Designated as Hedging Instruments
    
Assets    
Total assets 0 13
Liabilities    
Total liabilities 7 1
Foreign Currency Options and Forwards | Not Designated as Hedging Instruments
    
Assets    
Total assets 81 76
Liabilities    
Total liabilities 7 25
Commodity & Other
    
Assets    
Total assets 11 30
Liabilities    
Total liabilities 72 86
Commodity & Other | Level 1
    
Assets    
Total assets 0 2
Liabilities    
Total liabilities 0 0
Commodity & Other | Level 2
    
Assets    
Total assets 8 25
Liabilities    
Total liabilities 13 30
Commodity & Other | Level 3
    
Assets    
Total assets 3 3
Liabilities    
Total liabilities 59 56
Commodity & Other | Designated as Hedging Instruments
    
Assets    
Total assets 2 2
Liabilities    
Total liabilities 8 3
Commodity & Other | Not Designated as Hedging Instruments
    
Assets    
Total assets 9 28
Liabilities    
Total liabilities $ 64 $ 83