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Long-term and Short-term Debt (Long-term and Short-term Outstanding) (Details) - USD ($)
$ in Millions
2 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ (88) $ (87)
Financing lease obligations   125 4
Long Term Debt Excluding Consolidated Securitization Entities Face Value   13,549 12,911
Long-term debt   13,461 12,824
Short-term debt   235 268
Debt And Capital Lease Obligations Face Value   13,784 13,179
Total   $ 13,696 13,092
Senior notes      
Debt Instrument [Line Items]      
Weighted Average Interest Rate   4.72%  
Debt Instrument, Maturity Date Range, Start   Jun. 15, 2022  
Debt Instrument, Maturity Date Range, End   May 13, 2046  
Long-term Debt, Gross   $ 12,460 11,923
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (81) (79)
Long-term Debt   $ 12,379 11,844
Debt Instrument, Maturity Date   Jun. 30, 2035  
Surplus notes      
Debt Instrument [Line Items]      
Weighted Average Interest Rate   7.79%  
Debt Instrument, Maturity Date Range, Start   Nov. 15, 2024  
Debt Instrument, Maturity Date Range, End   Nov. 01, 2025  
Long-term Debt, Gross   $ 507 507
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (4) (4)
Long-term Debt   $ 503 503
Other notes      
Debt Instrument [Line Items]      
Weighted Average Interest Rate   4.62%  
Debt Instrument, Maturity Date Range, Start   Sep. 07, 2020  
Debt Instrument, Maturity Date Range, End   Jan. 28, 2058  
Long-term Debt, Gross   $ 457 477
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   (3) (4)
Long-term Debt   454 473
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
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   1.76%  
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   6.50%  
Amendment [Member] | Other Notes MPEH [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Nov. 15, 2022 Nov. 20, 2024  
Committed Credit Facility Three [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Expiration Date   Dec. 28, 2024  
Committed Credit Facility Six [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Expiration Date   Dec. 31, 2037  
General Credit Facility Three [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Expiration Date   Dec. 20, 2021