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Long-term and Short-term Debt (Narrative) (Details) £ in Millions, $ in Millions, ¥ in Billions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Apr. 30, 2024 USD ($) | Apr. 30, 2024 GBP (£) | Jan. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 05, 2024 USD ($) | Apr. 11, 2024 | Mar. 07, 2024 USD ($) | Mar. 07, 2024 JPY (¥) | Jul. 12, 2023 USD ($) | Mar. 31, 2023 | Feb. 10, 2023 | Jan. 06, 2023 USD ($) | Jul. 11, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  |  |  |  |  |  | 6.65% | 8.63% | 5.23% |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  |  |  |  | $ 101 | $ 108 |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year One |  |  |  |  |  |  | 1,300 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Two |  |  |  |  |  |  | 162 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Three |  |  |  |  |  |  | 52 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Four |  |  |  |  |  |  | 349 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Five |  |  |  |  |  |  | 457 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  |  |  |  |  | 12,800 |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt |  |  |  |  |  |  | 738 | 740 | $ 655 |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  | 465 | 119 |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Principal Outstanding |  |  |  |  |  |  | $ 14,530 | 14,622 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.70% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  |  |  |  | $ 99 | 106 |  |  |  |  |  |  |  |  |  |
Other Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Principal Outstanding |  |  |  |  |  |  | 401 | 495 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
senior debt $500M 5.30% due December 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |
senior debt $250M 5.30% due December 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
senior debt $750M 5.30% due December 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
senior debt Sterling 350 million 5.3753% due Dec 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 5.375% |  |  |  |  |  |  |
Early Repayment of Senior Debt | $ 438 | £ 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JPY senior debt $752 million March 2029 to 2059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 752 |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |
JPY senior debt 7.1 billion March 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 7.1 |  |  |  |  |
JPY senior debt 23.1 billion March 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | 23.1 |  |  |  |  |
JPY senior debt 16.7 billion March 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | 16.7 |  |  |  |  |
JPY senior debt 11.2 billion March 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | 11.2 |  |  |  |  |
JPY senior debt 15.5 billion March 2044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | 15.5 |  |  |  |  |
JPY senior debt 23.5 billion March 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | 23.5 |  |  |  |  |
JPY senior debt 15.2 billion March 2059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 15.2 |  |  |  |  |
JYP senior debt 7.1 billion March 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.009% | 1.009% |  |  |  |  |
JYP senior debt 23.1 billion March 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.415% | 1.415% |  |  |  |  |
JYP senior debt 16.7 billion March 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.67% | 1.67% |  |  |  |  |
JYP senior debt 11.2 billion March 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 1.953% | 1.953% |  |  |  |  |
JYP senior debt 15.5 billion March 2044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 2.195% | 2.195% |  |  |  |  |
JYP senior debt 23.5 billion March 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 2.39% | 2.39% |  |  |  |  |
JYP senior debt 15.2 billion March 2059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 2.448% | 2.448% |  |  |  |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-term Borrowings |  |  |  |  |  |  | 465 | 115 |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  | 133 | 0 |  |  |  |  |  |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 124.00% |  |  | 5.23% |  |  |  |  |  | 100.00% |  |  |
Long Term Debt Aggregate Maturities, Year One |  |  |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Two |  |  |  |  |  |  | 427 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Three |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Four |  |  |  |  |  |  | 213 |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Aggregate Maturities, Year Five |  |  |  |  |  |  | 625 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  |  |  |  |  | 13,400 |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt |  |  |  |  |  |  | 920 | $ 907 | $ 829 |  |  |  |  |  |  |  |  |
Committed Credit Facility Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | 2,491 |  |  |  |  |  |  |  |  |  |  |
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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