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Derivative and Hedging Activities - Narrative (Details)
€ in Millions, MMBTU in Billions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2006
USD ($)
$ / €
Sep. 30, 2016
USD ($)
counterparty
Derivatives
$ / €
Sep. 30, 2016
USD ($)
MMBTU
counterparty
Derivatives
$ / €
Sep. 30, 2016
EUR (€)
counterparty
Derivatives
$ / €
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Derivatives
$ / €
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2006
EUR (€)
$ / €
Derivative [Line Items]                    
Number of Interest Rate Derivatives Held | Derivatives   0 0 0   0        
Derivative Liability, Fair Value, Gross Liability   $ (177,000,000) $ (177,000,000)              
Debt Instrument, Face Amount   8,717,000,000 8,717,000,000     $ 9,706,000,000        
Accumulated other comprehensive loss   (101,000,000) (101,000,000)     (99,000,000)        
Expected amount to be transferred of during the next 12 months   (22,000,000) (22,000,000)              
Cash Collateral for Borrowed Securities   0 0     0        
Cash Flow Hedging [Member]                    
Derivative [Line Items]                    
Accumulated other comprehensive loss   (101,000,000) (101,000,000)   $ (104,000,000) (99,000,000) $ (119,000,000) $ (131,000,000) $ (143,000,000)  
Cash Flow Hedging [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]                    
Derivative [Line Items]                    
Accumulated other comprehensive loss   (92,000,000) (92,000,000)              
Senior Notes [Member]                    
Derivative [Line Items]                    
Debt Instrument, Repurchased Face Amount   $ 181,000,000 $ 181,000,000              
6.25% Euro-Denominated Senior Notes Due 2017 [ Member] | Senior Notes [Member]                    
Derivative [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage   6.25% 6.25% 6.25%            
Debt Instrument, Face Amount   $ 299,000,000 $ 299,000,000     329,000,000        
Interest Rate Contract [Member]                    
Derivative [Line Items]                    
Amortization Period of Deferred Gain (Loss) on Discontinuation of Fair Value Hedge     4 years              
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge   6,000,000 $ 6,000,000     7,000,000        
Debt Instrument, Face Amount   $ 0 $ 0     $ 0        
Cross Currency Interest Rate Contract [Member] | 6.25% Euro-Denominated Senior Notes Due 2017 [ Member] | Senior Notes [Member]                    
Derivative [Line Items]                    
Debt Instrument, Repurchased Face Amount | €       € 36            
Debt Instrument, Interest Rate, Stated Percentage   6.25% 6.25% 6.25%   6.25%        
Cash paid to purchase debt     $ 8,000,000              
Semi Annual Interest Rate Swap Payments By Counterparty | €       € 266           € 8
Short-term Debt, Refinanced, Description $ 13,000,000 $ 355,000,000 $ 355,000,000              
Dollar Equivalent Interest Rate 7.491%                  
Derivative, Forward Exchange Rate | $ / € 1.3325 1.1235 1.1235 1.1235   1.0862       1.3325
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]                    
Derivative [Line Items]                    
Derivative Liability, Fair Value, Gross Liability   $ (56,000,000) $ (56,000,000)     $ (52,000,000)        
Other Contracts, A [Member]                    
Derivative [Line Items]                    
Derivative, Number of Instruments Held | Derivatives   1 1 1            
Other Contracts, A [Member] | Minimum [Member]                    
Derivative [Line Items]                    
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU     90              
Other Contracts, A [Member] | Fair Value, Inputs, Level 3 [Member] | Marketing, Gathering And Compression [Member]                    
Derivative [Line Items]                    
Gain (Loss) on Sale of Derivatives   $ 146,000,000                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings   $ 280,000,000 $ 297,000,000              
Credit Risk [Member]                    
Derivative [Line Items]                    
Number of counterparties in hedge facility | counterparty   13 13 13