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Long-term and Short-term Debt (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 12, 2023 | Mar. 31, 2023 | Feb. 10, 2023 | Jan. 06, 2023 | Jul. 11, 2022 | Mar. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Other Short-term Borrowings |  | $ 119 | $ 76 |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 8.63% | 5.23% | 1.41% |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | $ 108 | $ 87 |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year One |  | 1,800 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Two |  | 1,300 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Three |  | 180 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Four |  | 52 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Five |  | 348 |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  | 11,900 |  |  |  |  |  |  |  |
Interest Expense, Debt |  | 740 | 655 | $ 647 |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Principal Outstanding |  | $ 14,622 | 13,671 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.70% |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | $ 106 | 83 |  |  |  |  |  |  |
Other Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Principal Outstanding |  | 495 | 500 |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | 2 | $ 3 |  |  |  |  |  |  |
Senior Debt $500 Million 3.048% which matures in December 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.048% |  |  |  |  |  |  |
Early Repayment of Senior Debt |  |  | $ 500 |  |  |  |  |  |  |
Redemption Premium |  |  | 17 |  |  |  |  |  |  |
senior debt 1.0 billion July 2052 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 1,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 5.00% |
Debt Issuance Costs, Gross |  |  |  |  |  |  |  |  | $ 11 |
senior debt $1.0 billion July 2033 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 1,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.375% |  |  |  |  |
Redemption Premium |  | 6 |  |  |  |  |  |  |  |
Senior Debt $1.0 billion 4.368% September 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.368% |  |  |
Early Repayment of Senior Debt |  | 1,000 |  |  |  |  |  |  |  |
senior debt $1.0 billion January 2054 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 1,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 5.25% |  |
Redemption Premium | $ 11 |  |  |  |  |  |  |  |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Other Short-term Borrowings |  | 115 | $ 76 |  |  |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.23% | 212.00% |  | 124.00% |  |  |  | 100.00%
Long Term Debt Aggregate Maturities, Year One |  | 1,400 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Two |  | 1,200 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Three |  | 476 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Four |  | 0 |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Five |  | 237 |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  | 12,700 |  |  |  |  |  |  |  |
Interest Expense, Debt |  | 907 | $ 829 | $ 847 |  |  |  |  |  |
Committed Credit Facility Six [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | 2,499 |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,896 |  |  |  |  |  |  |  |
Committed Credit Facility Six [Member] | Brighthouse Financial, Inc |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 2,500 |  |  |  |  |  |  |  |

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