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Debt (Senior Notes - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 26, 2023
Jan. 31, 2015
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
May 31, 2022
Jan. 06, 2022
Apr. 07, 2020
Jul. 31, 2018
Debt Instrument [Line Items]                  
Loss on extinguishment of debt     $ 19 $ 2          
Senior Notes                  
Debt Instrument [Line Items]                  
Repurchased amount       223          
Loss on extinguishment of debt       $ 2          
Senior Notes | LIBOR                  
Debt Instrument [Line Items]                  
Incremental increase in basis points resulting from downgrades   0.25%              
Incremental decrease in basis points resulting from upgrades   0.25%              
4.95% Senior Notes due January 2025 | Senior Notes                  
Debt Instrument [Line Items]                  
Senior notes, noncurrent   $ 1,000              
Stated interest rate   4.95% 4.95%   4.95% 5.70% 5.95% 6.45% 6.20%
4.10% Senior Notes due March 2022 | Senior Notes                  
Debt Instrument [Line Items]                  
Stated interest rate       4.10%          
Repurchased amount       $ 201          
8.375% Senior Notes due September 2028 | Senior Notes                  
Debt Instrument [Line Items]                  
Stated interest rate     8.375% 8.375% 8.375%        
Repurchased amount       $ 5          
7.75% Senior Notes due October 2027 | Senior Notes                  
Debt Instrument [Line Items]                  
Stated interest rate 7.75%     7.75% 7.75%        
Repurchased amount       $ 15          
Loss on extinguishment of debt $ 19                
Debt instrument, redemption price, percentage of principal amount redeemed 103.875%                
Accrued interest $ 13                
Repayments of senior debt 450                
Write off of deferred debt issuance cost 3                
7.75% Senior Notes due October 2027 | Senior Notes | Funded from Cash on Hand                  
Debt Instrument [Line Items]                  
Repayments of senior debt 316                
7.75% Senior Notes due October 2027 | Senior Notes | Funded from Debt Borrowings                  
Debt Instrument [Line Items]                  
Repayments of senior debt $ 134