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Fair Value (Level 3 Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (127) $ 133 $ (127) $ 133 $ (47) $ 63 $ 118 $ 93
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (56)   (55) 26        
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities (2) (2) (3) 6        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (14) 5 (19) (7)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 6   38 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 45   48          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       (34)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (64) 3 (71) 14        
Other comprehensive income - Derivative activity [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) (47) 12 (123) 48        
Interest Rate Contract [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (233) (96) (233) (96) (243) (140) (111) (151)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 0   (1) 28        
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, Purchases, Sales, Issues, Settlements [Abstract]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 2 3 5 12        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0   32 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 45   48          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       34        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0 1 0 32        
Interest Rate Contract [Member] | Other comprehensive income - Derivative activity [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) (37) 12 (113) 48        
Foreign currency derivatives [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 113 221 113 221 192 199 219 240
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (54)   (52) (3)        
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, Purchases, Sales, Issues, Settlements [Abstract]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (15) 2 (24) (16)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0   0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (62) 2 (69) (19)        
Foreign currency derivatives [Member] | Other comprehensive income - Derivative activity [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) (10) 0 (10) 0        
Cross Currency [Domain]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (6) 0 (6) 0 0 0 0 0
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, Purchases, Sales, Issues, Settlements [Abstract]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 6   6 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0 0 0 0        
Cross Currency [Domain] | Other comprehensive income - Derivative activity [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0   0        
Commodity Contract [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (1) 8 (1) 8 $ 4 $ 4 $ 10 $ 4
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (2)   (2) 1        
Fair Value Measurements With Unobservable Inputs Reconciliation Recurring Basis Regulatory Assets Liabilities (2) (2) (3) 6        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases, Sales, Issues, Settlements [Abstract]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (1) 0 0 (3)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0   0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 0   0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (2) 0 (2) 1        
Commodity Contract [Member] | Other comprehensive income - Derivative activity [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]                
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