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Fair Value Measurements (Carrying Amount and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments, net $ (4,734) $ (1,502)
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 21 28
Derivative instruments, net (4,734) (1,502)
Carrying Amount | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 4,209 4,430
Carrying Amount | Term Loan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Term Loan B due 2027 549 550
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 21 28
Derivative instruments, net (4,734) (1,502)
Fair Value | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes 4,318 4,745
Fair Value | Term Loan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Term Loan B due 2027 549 550
2018 revolving credit facility due April 2024 | Carrying Amount | Long-term debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2018 revolving credit facility due April 2024 174 460
2018 revolving credit facility due April 2024 | Fair Value | Long-term debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
2018 revolving credit facility due April 2024 $ 174 $ 460