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Derivative Instruments and Hedging Activities - Part 1 (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings $ 54,000,000   $ 52,000,000 $ 3,000,000  
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities 0 $ 0 0 0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 15,000,000 (2,000,000) 24,000,000 16,000,000  
Derivative Liability, Fair Value, Gross Liability (34,000,000)   (34,000,000)   $ (41,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (62,000,000) 2,000,000 (69,000,000) (19,000,000)  
Interest Rate Contract [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 0   1,000,000 (28,000,000)  
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities 0 0 0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (2,000,000) (3,000,000) (5,000,000) (12,000,000)  
Derivative Liability, Fair Value, Gross Liability (499,000,000)   (499,000,000)   (208,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0 1,000,000 0 32,000,000  
Interest Rate Contract [Member] | Libor and Euribor [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 5,897,000,000   5,897,000,000    
Cross currency derivatives [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 0   0 0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)     0    
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities 0 0 0 0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 0 0 0  
Derivative Liability, Fair Value, Gross Liability (9,000,000)   (9,000,000)   (5,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0 0 0 0  
Commodity Contract [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 2,000,000   2,000,000 (1,000,000)  
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities (2,000,000) (2,000,000) (3,000,000) 6,000,000  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 1,000,000 0 0 3,000,000  
Derivative Liability, Fair Value, Gross Liability (23,000,000)   (23,000,000)   (3,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (2,000,000) 0 (2,000,000) 1,000,000  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 56,000,000   55,000,000 (26,000,000)  
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities (2,000,000) (2,000,000) (3,000,000) 6,000,000  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 14,000,000 (5,000,000) 19,000,000 7,000,000  
Derivative Liability, Fair Value, Gross Liability (565,000,000)   (565,000,000)   $ (257,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (64,000,000) 3,000,000 (71,000,000) 14,000,000  
Natural Gas and Natural Gas Liquids [Member]          
Derivative Tables [Line Items]          
Commodity Contract Asset, Current 54,000,000   54,000,000    
Energy [Domain]          
Derivative Tables [Line Items]          
Commodity Contract Asset, Current 6,000,000   6,000,000    
Coal [Member]          
Derivative Tables [Line Items]          
Commodity Contract Asset, Current 10,000,000   10,000,000    
Unidad de Fomento (funds code) | Cross currency derivatives [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 297,000,000   297,000,000    
Euro EUR [Member] | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 29,000,000   29,000,000    
Argentina, Pesos | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 32,000,000   32,000,000    
Chile, Pesos | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 234,000,000   234,000,000    
Colombia, Pesos | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 161,000,000   161,000,000    
Other unspecified currency [Domain] | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 180,000,000   180,000,000    
Other comprehensive income - Derivative activity [Member] | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) (10,000,000) 0 (10,000,000) 0  
Other comprehensive income - Derivative activity [Member] | Interest Rate Contract [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) (37,000,000) 12,000,000 (113,000,000) 48,000,000  
Other comprehensive income - Derivative activity [Member] | Cross currency derivatives [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0   0  
Other comprehensive income - Derivative activity [Member] | Commodity Contract [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0  
Other comprehensive income - Derivative activity [Member]          
Derivative Tables [Line Items]          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) $ (47,000,000) $ 12,000,000 $ (123,000,000) $ 48,000,000