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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 |  |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings, excluding amounts related to consolidated securitization entities, as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References No definition available. + Details
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