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Long-term and Short-term Debt (Long-term and Short-term Outstanding) (Details)
$ in Millions, ¥ in Billions
1 Months Ended
Jul. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JPY (¥)
Debt Instrument [Line Items]            
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ (82) $ (90)      
Long Term Debt Excluding Consolidated Securitization Entities Face Value   14,015 14,688      
Long-term debt   13,933 14,598      
Short-term debt   341 393      
Debt And Capital Lease Obligations Face Value   14,356 15,081      
Total   14,274 14,991      
Debt Instrument, Face Amount     3,200      
Debt Issuance Costs, Gross     6   $ 9  
Long-term Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   0 0      
Finance Lease, Liability   81 106      
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   4.44%        
Debt Instrument, Principal Outstanding   $ 12,891 13,548      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (77) (85)      
Long-term Debt   $ 12,814 13,463      
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   (2) (3)      
Long-term Debt   $ 505 504      
Other notes            
Debt Instrument [Line Items]            
Weighted Average Interest Rate   2.48%        
Debt Instrument, Principal Outstanding   $ 536 527      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (3) (2)      
Long-term Debt   533 525      
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   0.08%        
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   3.75%        
Senior Debt Yen 25.2 Billion May 2026 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount         $ 230 ¥ 25.2
Debt Instrument, Interest Rate, Stated Percentage         0.495% 0.495%
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