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Long-term and Short-term Debt (Long-term and Short-term Outstanding) (Details)
$ in Millions, ¥ in Billions
1 Months Ended 12 Months Ended
Jul. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
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     $ (90)   $ (88)  
Financing lease obligations     106   125  
Long Term Debt Excluding Consolidated Securitization Entities Face Value     14,688   13,549  
Long-term debt     14,598   13,461  
Short-term debt     393   235  
Debt And Capital Lease Obligations Face Value     15,081   13,784  
Total     14,991   13,696  
Debt Instrument, Face Amount         3,200  
Debt Issuance Costs, Gross     6   9  
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     4.28%      
Debt Instrument, Principal Outstanding     $ 13,548   12,460  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net     (85)   (81)  
Long-term Debt     $ 13,463   12,379  
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     (3)   (4)  
Long-term Debt     $ 504   503  
Other notes            
Debt Instrument [Line Items]            
Weighted Average Interest Rate     2.89%      
Debt Instrument, Principal Outstanding     $ 527   457  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net     (2)   (3)  
Long-term Debt     525   454  
Capital Lease Obligations [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net     0   0  
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   $ 350 $ 75    
Repayments of Long-term Debt $ 75 $ 50        
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     0.14%      
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 Three [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 400      
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