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Schedule II - Aflac Incorporated (Parent Only) - Summary of Notes Payable and Lease Obligations (Detail 2) $ in Millions, ¥ in Billions | Dec. 31, 2024 JPY (¥) | Mar. 31, 2024 JPY (¥) | Dec. 31, 2023 JPY (¥) | Sep. 30, 2022 JPY (¥) | Aug. 31, 2022 JPY (¥) | Apr. 30, 2021 JPY (¥) | Mar. 31, 2021 USD ($) | Apr. 30, 2020 USD ($) | Mar. 31, 2020 JPY (¥) | Dec. 31, 2019 JPY (¥) | Oct. 31, 2018 JPY (¥) | Oct. 31, 2018 USD ($) | Oct. 31, 2017 JPY (¥) | Jan. 31, 2017 JPY (¥) | Dec. 31, 2016 | Sep. 30, 2016 USD ($) | Aug. 31, 2010 USD ($) | Dec. 31, 2009 USD ($)
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1.125% senior notes due March 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.125% |  | 1.125% |  |  |  | 1.125% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | $ |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
2.875% senior notes due October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.875% |  | 2.875% |  |  |  |  |  |  |  |  |  |  |  |  | 2.875% |  |
Debt instrument, principal amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |
3.60% senior notes due April 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 3.60% |  | 3.60% |  |  |  |  | 3.60% |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | $ |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
6.90% senior notes due December 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 6.90% |  | 6.90% |  |  |  |  |  |  |  |  |  |  |  | 6.90% |  |  |
Debt instrument, principal amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400
6.45% senior notes due August 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 6.45% |  | 6.45% |  |  |  |  |  |  |  |  |  |  |  | 6.45% |  |  |
Debt instrument, principal amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450 |
4.00% senior noted due October 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 4.00% |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
Debt instrument, principal amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  |
4.750% senior notes due January 2049 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 4.75% |  | 4.75% |  |  |  |  |  |  |  | 4.75% | 4.75% |  |  |  |  |  |
Debt instrument, principal amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 550 |  |  |  |  |  |
.300% senior notes due September 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.30% |  | 0.30% |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.4 |  | ¥ 12.4 |  |  |  |  |  | ¥ 12.4 |  |  |  |  |  |  |  |  |
.932% senior notes due January 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.932% |  | 0.932% |  |  |  |  |  |  |  |  |  |  | 0.932% |  |  |  |
Debt instrument, principal amount | ¥ 60.0 |  | ¥ 60.0 |  |  |  |  |  |  |  |  |  |  | ¥ 60.0 |  |  |  |
1.048% senior notes due March 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.048% | 1.048% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 13.0 | ¥ 13.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.075% senior notes due September 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.075% |  | 1.075% | 1.075% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 33.4 |  | ¥ 33.4 | ¥ 33.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
.500% senior notes due December 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.50% |  | 0.50% |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.6 |  | ¥ 12.6 |  |  |  |  |  |  | ¥ 12.6 |  |  |  |  |  |  |  |
.550% senior notes due March 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.55% |  | 0.55% |  |  |  |  |  | 0.55% |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 13.3 |  | ¥ 13.3 |  |  |  |  |  | ¥ 13.3 |  |  |  |  |  |  |  |  |
1.159% senior notes due October 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.159% |  | 1.159% |  |  |  |  |  |  |  | 1.159% | 1.159% |  |  |  |  |  |
Debt instrument, principal amount | ¥ 29.3 |  | ¥ 29.3 |  |  |  |  |  |  |  | ¥ 29.3 |  |  |  |  |  |  |
1.412% senior notes due March 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.412% | 1.412% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 27.9 | ¥ 27.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
.633% senior notes due April 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.633% |  | 0.633% |  |  | 0.633% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 30.0 |  | ¥ 30.0 |  |  | ¥ 30.0 |  |  |  |  |  |  |  |  |  |  |  |
.843% senior notes due December 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.843% |  | 0.843% |  |  |  |  |  |  | 0.843% |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 9.3 |  | ¥ 9.3 |  |  |  |  |  |  | ¥ 9.3 |  |  |  |  |  |  |  |
.750% senior notes due March 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.75% |  | 0.75% |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 20.7 |  | ¥ 20.7 |  |  |  |  |  | ¥ 20.7 |  |  |  |  |  |  |  |  |
1.320% senior notes due December 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.32% |  | 1.32% | 1.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 21.1 |  | ¥ 21.1 | ¥ 21.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
.844% senior notes due April 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.844% |  | 0.844% |  |  | 0.844% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.0 |  | ¥ 12.0 |  |  | ¥ 12.0 |  |  |  |  |  |  |  |  |  |  |  |
1.488% senior notes due October 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.488% |  | 1.488% |  |  |  |  |  |  |  | 1.488% | 1.488% |  |  |  |  |  |
Debt instrument, principal amount | ¥ 15.2 |  | ¥ 15.2 |  |  |  |  |  |  |  | ¥ 15.2 |  |  |  |  |  |  |
1.682% senior notes due March 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.682% | 1.682% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 7.7 | ¥ 7.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.600% senior notes due March 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.60% | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 18.3 | ¥ 18.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
.934% senior notes due December 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.934% |  | 0.934% |  |  |  |  |  |  | 0.934% |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 9.8 |  | ¥ 9.8 |  |  |  |  |  |  | ¥ 9.8 |  |  |  |  |  |  |  |
.830% senior notes due March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.83% |  | 0.83% |  |  |  |  |  | 0.83% |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 10.6 |  | ¥ 10.6 |  |  |  |  |  | ¥ 10.6 |  |  |  |  |  |  |  |  |
1.740% senior notes due March 2036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.74% | 1.74% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 15.0 | ¥ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.039% senior notes due April 2036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.039% |  | 1.039% |  |  | 1.039% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 10.0 |  | ¥ 10.0 |  |  | ¥ 10.0 |  |  |  |  |  |  |  |  |  |  |  |
1.594% senior notes due September 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.594% |  | 1.594% | 1.594% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 6.5 |  | ¥ 6.5 | ¥ 6.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.750% senior notes due October 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.75% |  | 1.75% |  |  |  |  |  |  |  | 1.75% | 1.75% |  |  |  |  |  |
Debt instrument, principal amount | ¥ 8.9 |  | ¥ 8.9 |  |  |  |  |  |  |  | ¥ 8.9 |  |  |  |  |  |  |
1.920% senior notes due March 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.92% | 1.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 16.5 | ¥ 16.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.122% senior notes due December 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.122% |  | 1.122% |  |  |  |  |  |  | 1.122% |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 6.3 |  | ¥ 6.3 |  |  |  |  |  |  | ¥ 6.3 |  |  |  |  |  |  |  |
1.264% senior notes due April 2041 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.264% |  | 1.264% |  |  | 1.264% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 10.0 |  | ¥ 10.0 |  |  | ¥ 10.0 |  |  |  |  |  |  |  |  |  |  |  |
2.160% senior notes due March 2044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.16% | 2.16% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 5.7 | ¥ 5.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.108% subordinated notes due October 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.108% |  | 2.108% |  |  |  |  |  |  |  |  |  | 2.108% |  |  |  |  |
Debt instrument, principal amount | ¥ 60.0 |  | ¥ 60.0 |  |  |  |  |  |  |  |  |  | ¥ 60.0 |  |  |  |  |
1.560% senior notes due April 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.56% |  | 1.56% |  |  | 1.56% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 20.0 |  | ¥ 20.0 |  |  | ¥ 20.0 |  |  |  |  |  |  |  |  |  |  |  |
2.144% senior notes due September 2052 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.144% |  | 2.144% | 2.144% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.0 |  | ¥ 12.0 | ¥ 12.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.400% senior notes due March 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.40% | 2.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 19.5 | ¥ 19.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated loan variable interest rate due August 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.84% |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 11.7 |  | ¥ 11.7 |  | ¥ 11.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated loan variable interest rate due August 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.94% |  | 0.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 25.3 |  | ¥ 25.3 |  | 25.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Yen-denominated loan variable interest rate due August 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.09% |  | 0.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 70.0 |  | ¥ 70.0 |  | ¥ 70.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.125% senior notes due March 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.125% |  | 1.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 2.875% senior notes due October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.875% |  | 2.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 3.60% senior notes due April 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 3.60% |  | 3.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 6.90% senior notes due December 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 6.90% |  | 6.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 6.45% senior notes due August 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 6.45% |  | 6.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 4.00% senior noted due October 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 4.00% |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 4.750% senior notes due January 2049 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 4.75% |  | 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .300% senior notes due September 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.30% |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.4 |  | ¥ 12.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .932% senior notes due January 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.932% |  | 0.932% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 60.0 |  | ¥ 60.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.048% senior notes due March 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.048% | 104.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 13.0 | ¥ 13.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.075% senior notes due September 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.075% |  | 1.075% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 33.4 |  | ¥ 33.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .500% senior notes due December 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.50% |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.6 |  | ¥ 12.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .550% senior notes due March 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.55% |  | 0.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 13.3 |  | ¥ 13.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.159% senior notes due October 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.159% |  | 1.159% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 29.3 |  | ¥ 29.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.412% senior notes due March 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.412% | 1.412% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 27.9 | ¥ 27.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .633% senior notes due April 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.633% |  | 0.633% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 30.0 |  | ¥ 30.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .843% senior notes due December 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.843% |  | 0.843% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 9.3 |  | ¥ 9.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .750% senior notes due March 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.75% |  | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 20.7 |  | ¥ 20.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.320% senior notes due December 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.32% |  | 1.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 21.1 |  | ¥ 21.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .844% senior notes due April 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.844% |  | 0.844% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.0 |  | ¥ 12.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.488% senior notes due October 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.488% |  | 1.488% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 15.2 |  | ¥ 15.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.682% senior notes due March 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.682% | 1.682% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 7.7 | ¥ 7.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.600% senior notes due March 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.60% | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 18.3 | ¥ 18.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .934% senior notes due December 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.934% |  | 0.934% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 9.8 |  | ¥ 9.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | .830% senior notes due March 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.83% |  | 0.83% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 10.6 |  | ¥ 10.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.740% senior notes due March 2036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.74% | 1.74% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 15.0 | ¥ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.039% senior notes due April 2036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.039% |  | 1.039% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 10.0 |  | ¥ 10.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.594% senior notes due September 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.594% |  | 1.594% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 6.5 |  | ¥ 6.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.750% senior notes due October 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.75% |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 8.9 |  | ¥ 8.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.920% senior notes due March 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.92% | 1.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 16.5 | ¥ 16.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.122% senior notes due December 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.122% |  | 1.122% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 6.3 |  | ¥ 6.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.264% senior notes due April 2041 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.264% |  | 1.264% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 10.0 |  | ¥ 10.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 2.160% senior notes due March 2044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.16% | 2.16% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 5.7 | ¥ 5.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 2.108% subordinated notes due October 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.108% |  | 2.108% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 60.0 |  | ¥ 60.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 1.560% senior notes due April 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.56% |  | 1.56% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 20.0 |  | ¥ 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 2.144% senior notes due September 2052 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.144% |  | 2.144% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 12.0 |  | ¥ 12.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | 2.400% senior notes due March 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.40% | 2.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 19.5 | ¥ 19.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | Yen-denominated loan variable interest rate due August 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.84% |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 11.7 |  | ¥ 11.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | Yen-denominated loan variable interest rate due August 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 0.94% |  | 0.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 25.3 |  | ¥ 25.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company | Yen-denominated loan variable interest rate due August 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 1.09% |  | 0.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount | ¥ 70.0 |  | ¥ 70.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 04 -Paragraph a -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 5 -Subsection 04 -Paragraph c -Subparagraph Schedule I -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 7 -Subsection 05 -Paragraph c -Subparagraph Schedule II -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 9 -Subsection 06 -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 6: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481231/810-10-45-11 + Details
Name: | srt_CondensedFinancialStatementsCaptionsLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
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