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Debt and Credit Agreements - Narrative (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) swap | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) swap | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating activities |  | $ (16,000,000) |  |  |  | $ (35,000,000) |  |  | $ (10,000,000) | [1] | $ 18,000,000 | [1] | $ 67,000,000 | $ (7,000,000) | $ (16,000,000)
Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility | $ 1,000,000,000.0 |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |  |  |  |
Borrowings outstanding | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Fixed Rate Notes Due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  | 250,000,000 |
Fixed Rate Notes Due Between 2036 and 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued | 1,050,000,000 |  | $ 1,050,000,000 |  |  |  |  | $ 800,000,000 | 1,050,000,000 |  |  |  |  | 1,050,000,000 |
3.25% Notes Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued | $ 850,000,000 |  |  |  |  |  |  |  | $ 850,000,000 |  |  |  |  |  |
Debt interest rate | 3.25% |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |
Unsecured Revolving Credit Facility Due 2028 | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility | $ 1,200,000,000 |  |  |  |  |  |  |  | $ 1,200,000,000 |  |  |  |  |  |
Borrowings outstanding | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Two Separate Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, number of fair value hedges | swap |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Derivative, term of contract (in years) |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Two Separate Fixed-to-Floating Interest Rate Swaps | Designated as Hedging Instrument | Fair Value Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate fair value hedge asset at fair value | 9,000,000 |  | $ 19,000,000 |  |  |  |  |  | 9,000,000 |  |  |  |  | 19,000,000 |
Fixed-to-Floating Interest Rate Swap | Fair Value Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, number of fair value hedges | swap |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Derivative, term of contract (in years) |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Fixed-to-Floating Interest Rate Swap | Designated as Hedging Instrument | Fair Value Hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedge derivative instrument liabilities at fair value | 125,000,000 |  | 107,000,000 |  |  |  |  |  | 125,000,000 |  |  |  |  | 107,000,000 |
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional value of interest forward interest rate swap | 500,000,000 |  | 114,000,000 |  |  |  |  |  | 500,000,000 |  |  |  |  | 114,000,000 |
Derivative asset, notional amount settled | 114,000,000 |  |  | $ 113,000,000 | $ 113,000,000 |  | $ 160,000,000 |  | 114,000,000 |  | $ 113,000,000 |  | $ 113,000,000 |  | $ 160,000,000
Other operating activities | 52,000,000 |  |  | $ 51,000,000 | $ 44,000,000 |  | $ 52,000,000 |  |  |  |  |  |  |  |
Derivative asset, unsettled notional amount | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Cash flow hedge derivative instrument assets at fair value |  |  | $ 48,000,000 |  |  |  |  |  |  |  |  |  |  | $ 48,000,000 |
[1] | See Note 11, Revision of Prior Period Financial Statements.

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