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Long-term and Short-term Debt (Long-term and Short-term Outstanding) (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Debt Instrument [Line Items]          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ (87) $ (82)    
Finance Lease, Liability   $ 56 $ 81    
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]   Long-term debt Long-term debt    
Long Term Debt Excluding Consolidated Securitization Entities Face Value   $ 14,734 $ 14,015    
Long-term debt   14,647 13,933    
Short-term debt   175 341    
Debt And Capital Lease Obligations Face Value   14,909 14,356    
Total   14,822 14,274    
Debt Issuance Costs, Gross       $ 6  
Long-term Debt [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   0 0    
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 75      
Senior notes          
Debt Instrument [Line Items]          
Weighted Average Interest Rate   4.42%      
Debt Instrument, Principal Outstanding   $ 13,671 12,891    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (83) (77)    
Long-term Debt   $ 13,588 12,814    
Debt Instrument, Interest Rate, Stated Percentage   5.70%      
Surplus notes          
Debt Instrument [Line Items]          
Weighted Average Interest Rate   7.79%      
Debt Instrument, Principal Outstanding   $ 507 507    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (1) (2)    
Long-term Debt   $ 506 505    
Other notes          
Debt Instrument [Line Items]          
Weighted Average Interest Rate   4.67%      
Debt Instrument, Principal Outstanding   $ 500 536    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (3) (3)    
Long-term Debt   497 533    
Short-term Debt [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ 0 $ 0    
Other Notes MPEH [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 50       $ 75
Repayments of Long-term Debt $ 75        
Minimum | Senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   0.50%      
Minimum | Surplus notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   7.63%      
Minimum | Other notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   0.45%      
Maximum | Senior notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   6.50%      
Maximum | Surplus notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   7.88%      
Maximum | Other notes          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   7.50%      
senior debt 1.0 billion March 2030 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount       $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage       4.55%  
Committed Credit Facility Six [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,896      
General Credit Facility Three [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   3,000      
Committed Credit FacilityMPEH [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 350