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Derivative Instruments and Hedging Activities (Derivative Instruments Not Designated for Hedge Accounting) (Details) (Not Designated as Hedging Instrument, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting $ 29 $ (149) $ (20)
Interest Rate Contract | Interest Expense
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting (1) (5) (4)
Interest Rate Contract | Net Equity In Earnings Of Affiliates
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting (6) 0 0
Foreign Exchange Contract | Net Equity In Earnings Of Affiliates
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting (24) 0 0
Foreign Exchange Contract | Foreign Currency Gain (Loss)
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting 64 (141) 60
Other Contract | Sales
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting 11 24 13
Other Contract | Regulated Revenue
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting 0 (10) 1
Other Contract | Cost of Sales
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting 1 2 (9)
Other Contract | Regulated Cost Of Sales
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting 2 (15) (5)
Other Contract | Income (Loss) From Operations Of Discontinued Business
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting $ (18) $ (4) $ (76)