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Long-Term Debt (Narrative) (Details) $ in Millions, ¥ in Billions	3 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jun. 17, 2025 USD ($)	Jun. 17, 2025 JPY (¥)	Mar. 04, 2025 USD ($)
U.S. government and agency
Debt Instrument, Redemption [Line Items]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value | $					$ 1,250
senior debt $1,250 M 50740% 2055
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount | $					$ 1,250
Payments of Debt Issuance Costs | $		$ 13
Debt Instrument, Interest Rate, Stated Percentage					5.74%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		1.2373%
JPY private placement senior debt $612M June 2025
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount | $			$ 612
Payments of Debt Issuance Costs | $	$ 5
JPY Private Placement Senior Notes 10.0 billion June 2032
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount				¥ 10.0
Debt Instrument, Interest Rate, Stated Percentage			2.14%	2.14%
JPY Private Placement Senior Notes 15.0 billion June 2035
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount				¥ 15.0
Debt Instrument, Interest Rate, Stated Percentage			2.46%	2.46%
JPY Private Placement Senior Notes 10.7 billion June 2037
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount				¥ 10.7
Debt Instrument, Interest Rate, Stated Percentage			2.59%	2.59%
JPY Private Placement Senior Notes 12.1 billion June 2040
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount				¥ 12.1
Debt Instrument, Interest Rate, Stated Percentage			2.83%	2.83%
JPY Private Placement Senior Notes 23.6 billion June 2045
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount				¥ 23.6
Debt Instrument, Interest Rate, Stated Percentage			3.29%	3.29%
JPY Private Placement Senior Notes 16.4 billion June 2055
Debt Instrument, Redemption [Line Items]
Debt Instrument, Face Amount				¥ 16.4
Debt Instrument, Interest Rate, Stated Percentage			3.62%	3.62%

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