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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Aug. 30, 2021
Debt Instrument [Line Items]          
Impairments   $ 0 $ 6 $ 2,830  
Not Designated as Hedging Instrument          
Debt Instrument [Line Items]          
Impact of non-performance risk on fair value of the net derivative liability position   $ 3 3    
Other non-core assets          
Debt Instrument [Line Items]          
Impairments     $ 6 5  
Other non-core assets | Nonrecurring          
Debt Instrument [Line Items]          
Impairments $ 6     5  
Carrying value of non core assets       $ 6  
Senior Notes | 4.10% Senior Notes due March 2022          
Debt Instrument [Line Items]          
Stated interest rate   4.10% 4.10%   4.10%