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Long-Term Debt (Narrative) (Details) £ in Millions, $ in Millions, ¥ in Billions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2024 USD ($) | Apr. 30, 2024 GBP (£) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 05, 2024 USD ($) | Apr. 11, 2024 | Mar. 07, 2024 USD ($) | Mar. 07, 2024 JPY (¥)
JPY senior debt $744 million March 2029 to 2059 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  |  |  | $ 752 |
Payments of Debt Issuance Costs | $ |  |  |  |  | $ 6 |  |  |  |
JYP senior debt 7.1 billion March 2029 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 1.009% | 1.009%
JYP senior debt 23.1 billion March 2031 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 1.415% | 1.415%
JYP senior debt 16.7 billion March 2034 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 1.67% | 1.67%
JYP senior debt 11.2 billion March 2039 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 1.953% | 1.953%
JYP senior debt 15.5 billion March 2044 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 2.195% | 2.195%
JYP senior debt 23.5 billion March 2054 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 2.39% | 2.39%
JYP senior debt 15.2 billion March 2059 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 2.448% | 2.448%
JPY senior debt 7.1 billion March 2029 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | ¥ 7.1
JPY senior debt 23.1 billion March 2031 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 23.1
JPY senior debt 16.7 billion March 2034 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 16.7
JPY senior debt 11.2 billion March 2039 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 11.2
JPY senior debt 15.5 billion March 2044 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 15.5
JPY senior debt 23.5 billion March 2054 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 23.5
JPY senior debt 15.2 billion March 2059 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | ¥ 15.2
senior debt Sterling 350 million 5.3753% due Dec 2024 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.375% |  |
Early Repayment of Senior Debt | $ 438 | £ 350 |  |  |  |  |  |  |
senior debt $500M 5.30% due December 2034 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ |  |  |  |  |  | $ 500 |  |  |
Payments of Debt Issuance Costs | $ |  |  |  | $ 4 |  |  |  |  |
senior debt $750M 5.30% due December 2034 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.30% |  |  |  |  |  |
senior debt $2500M 5.30% due December 2034 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ |  |  | $ 250 |  |  |  |  |  |
Payments of Debt Issuance Costs | $ |  |  | $ 2 |  |  |  |  |  |

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