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Derivative Instruments and Hedging Activities - Part 1 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
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 $ (3) $ (16) $ 3 $ 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 9 8 18 16  
Derivative Liability, Fair Value, Gross Liability (51)   (51)   $ (30)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (5) 8 (21) (16)  
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 (13) 0 (27) 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 (4) (9) (10) (19)  
Derivative Liability, Fair Value, Gross Liability (182)   (182)   (262)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 15 0 31 2  
Interest Rate Contract [Member] | Libor and Euribor [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 4,492   4,492    
Cross currency derivatives [Member]          
Derivative Tables [Line Items]          
Derivative Liability, Fair Value, Gross Liability (3)   (3)   (3)
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 0 1 (1) 1  
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities 9 10 9 10  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 2 2 4 5  
Derivative Liability, Fair Value, Gross Liability (5)   (5)   (20)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0 0 1 0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (16) (15) (25) 1  
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities 9 10 9 10  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 7 1 12 2  
Derivative Liability, Fair Value, Gross Liability (241)   (241)   $ (315)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 10 8 11 (14)  
Unidad de Fomento (funds code) | Cross currency derivatives [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 373   373    
Euro EUR [Member] | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 218   218    
Argentina, Pesos | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 120   120    
Chile, Pesos | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 381   381    
Colombia, Pesos | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 212   212    
Other unspecified currency [Domain] | Foreign Exchange Contract [Member]          
Derivative Tables [Line Items]          
Derivatives, notional amount 260   260    
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) 0 0 0 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) 1 (17) 32 (28)  
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) $ 1 $ (17) $ 32 $ (28)