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Derivative Instruments and Hedging Activities - Part 2 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets    
Derivative Assets, Gross $ 222 $ 240
Liabilities    
Derivative Liabilities, Gross 475 371
Subject to netting arrangement [Member]
    
Assets    
Derivative Assets, Gross 92 91
Derivative Assets Not Offset Under Netting Arrangements (18) (9)
Derivative Assets Not Offset By Collateral 0 (3)
Derivative Assets, Net 74 79
Liabilities    
Derivative Liabilities, Gross 438 314
Derivative Liabilities Not Offset Under Netting Arrangements (18) (9)
Derivative Liabilities Not Offset By Collateral (16) (6)
Derivative Liabilities, Net 404 299
Current [Member]
    
Assets    
Derivative Assets, Gross 55 32
Liabilities    
Derivative Liabilities, Gross 177 157
Noncurrent [Member]
    
Assets    
Derivative Assets, Gross 167 208
Liabilities    
Derivative Liabilities, Gross 298 214
Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 85 113
Liabilities    
Derivative Liabilities, Gross 440 351
Not Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 137 127
Liabilities    
Derivative Liabilities, Gross 35 20
No longer carried at fair value [Member]
    
Assets    
Derivative Assets, Gross 165 169
Liabilities    
Derivative Liabilities, Gross 187 190
Interest rate derivatives [Member]
    
Assets    
Derivative Assets, Gross 46 98
Liabilities    
Derivative Liabilities, Gross 376 322
Interest rate derivatives [Member] | Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 44 96
Liabilities    
Derivative Liabilities, Gross 373 318
Interest rate derivatives [Member] | Not Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 2 2
Liabilities    
Derivative Liabilities, Gross 3 4
Cross currency derivatives [Member]
    
Assets    
Derivative Assets, Gross 4 5
Liabilities    
Derivative Liabilities, Gross 11 11
Cross currency derivatives [Member] | Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 4 5
Liabilities    
Derivative Liabilities, Gross 11 11
Cross currency derivatives [Member] | Not Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 0 0
Liabilities    
Derivative Liabilities, Gross 0 0
Foreign currency derivatives [Member]
    
Assets    
Derivative Assets, Gross 123 113
Liabilities    
Derivative Liabilities, Gross 44 21
Foreign currency derivatives [Member] | Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 7 4
Liabilities    
Derivative Liabilities, Gross 34 15
Foreign currency derivatives [Member] | Not Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 116 109
Liabilities    
Derivative Liabilities, Gross 10 6
Commodity derivatives [Member]
    
Assets    
Derivative Assets, Gross 49 24
Liabilities    
Derivative Liabilities, Gross 44 17
Commodity derivatives [Member] | Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 30 8
Liabilities    
Derivative Liabilities, Gross 22 7
Commodity derivatives [Member] | Not Designated as Hedging Instruments [Member]
    
Assets    
Derivative Assets, Gross 19 16
Liabilities    
Derivative Liabilities, Gross $ 22 $ 10