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v3.23.3

Capitalization - Additional Information (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2023 USD ($) $ / shares | Mar. 31, 2023 USD ($) dealer $ / shares | Jun. 30, 2023 USD ($) shares | Mar. 31, 2023 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) shares | Dec. 31, 2023 USD ($) | Feb. 28, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Number of dealers | dealer |  | 2 |  |  |  |  |  |  |
Authorized repurchased amount |  | $ 1,000 |  | $ 1,000 |  |  |  |  |
Par value (in usd per share) | $ / shares |  | $ 0.10 |  | $ 0.10 |  |  |  |  |
Repurchase of common shares |  |  |  |  | $ 1,000 | $ 0 | $ 1,000 |  |
Shares repurchased (in shares) | shares |  |  | 1,812,497 |  |  |  | 8,730,766 |  |
Par value of shares acquired (in usd per share) | $ / shares | $ 91.63 |  |  |  |  |  |  |  |
Common stock repurchases | $ 800 |  | $ 2 | $ 1,008 |  |  |  |  |
Adjustment to APIC | $ 200 |  |  |  |  |  |  |  |
Adjustments to APIC reflecting fair value of common shares issued |  |  | $ 169 |  |  |  |  |  |
5.20% Debentures Due 2033 | Debentures |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 500
Interest rate (percent) |  |  |  |  |  |  |  |  | 5.20%
6.59% Debentures Due 2033 | Debentures | O&R | Scenario, Forecast |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 50 |
Interest rate (percent) |  |  |  |  |  |  |  | 6.59% |

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