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Condensed Financial Information (Parent Company) (Long-term Debt Outstanding) (Details) - Parent Company $ in Millions, ¥ in Billions | Dec. 31, 2024 USD ($) | Mar. 31, 2024 | Dec. 31, 2023 USD ($) | Jul. 10, 2023 JPY (¥) | Jul. 08, 2023 JPY (¥) | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 124.00% |  |  |  | 100.00% | 5.23%
Long-term Debt [Abstract] |  |  |  |  |  |  |
Senior Notes | $ 14,431 |  | $ 14,516 |  |  |  |
Long-term Debt | 15,878 |  | 16,101 |  |  |  |
Senior Notes, Unaffiliated [Member] |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Senior Notes | 14,431 |  | 14,516 |  |  |  |
Senior Notes, Affiliated [Member] |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Senior Notes | $ 1,447 |  | $ 1,585 |  |  |  |
Minimum | Senior Notes, Unaffiliated [Member] |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 0.50% |  |  |  |  |  |
Minimum | Senior Notes, Affiliated [Member] |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.59% |  |  |  |  |  |
Maximum | Senior Notes, Unaffiliated [Member] |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.50% |  |  |  |  |  |
Maximum | Senior Notes, Affiliated [Member] |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 7.45% |  |  |  |  |  |
SeniorDebtYen37.3BillionJuly2023 | Senior Notes, Affiliated [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.6015% |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Senior Notes | ¥ |  |  |  |  | ¥ 37.3 |  |
SeniorDebtYen37.3BillionJuly2030 | Senior Notes, Affiliated [Member] |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.1575% |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |
Senior Notes | ¥ |  |  |  | ¥ 37.3 |  |  |
Note $80M 5.68% maturity March 2033 |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.68% |  |  |  |

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