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Debt (2022 Credit Facility - Narrative) (Details)
$ in Millions
3 Months Ended
Aug. 04, 2022
USD ($)
Dec. 22, 2021
Mar. 31, 2023
USD ($)
Apr. 05, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]          
Subsidiary ownership     100.00%    
Long-term debt          
Debt Instrument [Line Items]          
Debt instrument, excluding current maturities, gross     $ 3,953   $ 4,414
2022 Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage 0.375% 0.15%      
2022 Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage 0.50% 0.275%      
Ratio of indebtedness to net capital   0.65      
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity     3,500    
Line of credit facility, increase, net $ 500        
Minimum current ratio 1.00        
Leverage ratio, percentage of credit limit 10.00%        
Leverage ratio, amount of credit limit $ 150        
Letters of credit     89    
Debt instrument, excluding current maturities, gross     $ 210   $ 250
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Subsequent Event          
Debt Instrument [Line Items]          
Aggregate commitment       $ 3,500  
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | On Or After March 31, 2022          
Debt Instrument [Line Items]          
Leverage ratio 4.00        
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Basis points 0.10% 0.10%      
Debt instrument, discount coverage ratio   9.00%      
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Base Rate          
Debt Instrument [Line Items]          
Basis points 1.00%        
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Basis points 0.50%        
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Minimum | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Basis points 1.75% 1.25%      
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Minimum | Base Rate          
Debt Instrument [Line Items]          
Basis points 0.75% 0.25%      
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Maximum | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Basis points 2.75% 1.875%      
Revolving Credit Facility | 2022 Revolving Credit Facility | Line of Credit | Maximum | Base Rate          
Debt Instrument [Line Items]          
Basis points 1.75% 0.875%      
Revolving Credit Facility | 2022 Revolving Credit Facility | Long-term debt          
Debt Instrument [Line Items]          
Minimum interest coverage ratio   1.50      
Revolving Credit Facility | 2022 Revolving Credit Facility Five-Year Tranche | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, expiration period     5 years    
Aggregate commitment     $ 2,000    
Revolving Credit Facility | 2022 Revolving Credit Facility Five-Year Tranche | Line of Credit | Subsequent Event          
Debt Instrument [Line Items]          
Aggregate commitment       2,000  
Revolving Credit Facility | 2022 Revolving Credit Facility Short-Term Tranche | Line of Credit          
Debt Instrument [Line Items]          
Aggregate commitment     $ 500    
Revolving Credit Facility | 2022 Revolving Credit Facility Short-Term Tranche | Line of Credit | Subsequent Event          
Debt Instrument [Line Items]          
Aggregate commitment       $ 500