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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Effective Portion of Cash Flow Hedges) (Details) (Cash Flow Hedging, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion $ 139,000,000 $ (169,000,000) $ (487,000,000)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (180,000,000) (233,000,000) (159,000,000)
Interest Rate Contract
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 155,000,000 (175,000,000) (475,000,000)
AOCI before tax expected increase (decrease) next 12 months (119,000,000)    
Interest Rate Contract | Interest Expense
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (127,000,000) (135,000,000) (125,000,000)
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring 0 10,000,000 0
Cash flow hedge additional transaction period   2 months  
Interest Rate Contract | Cost of Sales
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (5,000,000) (6,000,000) (3,000,000)
Interest Rate Contract | Net Equity In Earnings Of Affiliates
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (6,000,000) (7,000,000) (4,000,000)
Interest Rate Contract | Asset Impairment Expense
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 0 (6,000,000) 0
Interest Rate Contract | Sale of Subsidiary Gain (Loss)
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (21,000,000) (96,000,000) 0
Cross Currency Interest Rate Contract
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (18,000,000) 4,000,000 (36,000,000)
AOCI before tax expected increase (decrease) next 12 months (4,000,000)    
Cross Currency Interest Rate Contract | Interest Expense
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (10,000,000) (12,000,000) (10,000,000)
Cross Currency Interest Rate Contract | Foreign Currency Gain (Loss)
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (18,000,000) 26,000,000 (16,000,000)
Foreign Exchange Contract
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 0 10,000,000 24,000,000
AOCI before tax expected increase (decrease) next 12 months 4,000,000    
Foreign Exchange Contract | Foreign Currency Gain (Loss)
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 12,000,000 5,000,000 1,000,000
Other Contract
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 2,000,000 (8,000,000) 0
AOCI before tax expected increase (decrease) next 12 months (3,000,000)    
Other Contract | Cost of Sales
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (2,000,000) 0 (2,000,000)
Other Contract | Sales
      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion $ (3,000,000) $ (2,000,000) $ 0