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Derivative Instruments and Hedging Activities - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period $ 3,139 $ 2,995 $ 3,300 $ 2,715  
Mark-to-market of cash flow hedge accounting contracts 6 0 20 11  
Balance at end of period 4,189 3,003 4,189 3,003  
Accumulated other comprehensive income (loss) 2   2   $ (6)
Losses expected to be realized from OCI during the next 12 months, net of income tax benefit of $— (1) (1)  
Accumulated OCL ending balance, income tax benefit 0 (4) 1 (4)  
Losses expected to be realized from OCL during the next 12 months, tax expense (benefit) 0   0    
AOCI Including Portion Attributable to Noncontrolling Interest          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period 3 (19) (11) (30)  
Balance at end of period 9 (19) 9 (19)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Reclassified from accumulated OCI (OCL) to income due to realization of previously deferred amounts 1 2 3 4  
Mark-to-market of cash flow hedge accounting contracts 5 (2) 17 7  
AOCI Attributable to Noncontrolling Interest          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) 7 (10) 7 (10)  
Accumulated Other Comprehensive (Loss) Income          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period 0 (10) (6) (14)  
Balance at end of period 2 (9) 2 (9)  
Accumulated other comprehensive income (loss) $ 2 $ (9) $ 2 $ (9)