Borrowings and Other Debt Obligations - Narrative (Details) $ in Millions	Sep. 30, 2024 USD ($)	Jun. 06, 2024 USD ($)	Apr. 22, 2024 USD ($)	Dec. 31, 2023 USD ($)	Oct. 24, 2023 USD ($)	Oct. 27, 2021 USD ($)	Sep. 30, 2021 USD ($)
Short-term Debt [Line Items]
Letters of credit outstanding, amount	$ 386			$ 376
Performance Letters of Credit
Short-term Debt [Line Items]
Letters of credit outstanding, amount	277			218
Financial Letters of Credit
Short-term Debt [Line Items]
Letters of credit outstanding, amount	40			52
Uncommitted Letters of Credit
Short-term Debt [Line Items]
Letters of credit outstanding, amount	69			106
Letters of credit outstanding, cash collateral	44			101
Amended LC Credit Agreement
Short-term Debt [Line Items]
Credit agreement, maximum capacity		$ 720	$ 680		$ 550
Credit agreement, increase limit		1,000
Amended LC Credit Agreement | Performance Letters of Credit
Short-term Debt [Line Items]
Credit agreement, maximum capacity		327	309		250
Amended LC Credit Agreement | Borrowings or Additional Performance or Financial Letters of Credit
Short-term Debt [Line Items]
Credit agreement, maximum capacity		$ 393	$ 371		$ 300
Senior Notes | Senior Notes 6.5 Percent Due 2028
Short-term Debt [Line Items]
Stated interest rate on debt							6.50%
Face amount of debt							$ 500
Long-Term Debt, Gross				248
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net				5
Senior Notes | Senior Notes 8.625 Percent Due 2030
Short-term Debt [Line Items]
Stated interest rate on debt						8.625%
Face amount of debt						$ 1,600
Long-Term Debt, Gross	1,600			1,600
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	12			13
Line of Credit | Amended LC Credit Agreement
Short-term Debt [Line Items]
Credit agreement, maximum capacity				$ 550
Credit Agreement Minimum Liquidity Requirement	250
Credit Agreement Minimum Liquidity Requirement, Increase Limit	$ 400
Debt instrument, covenant, minimum interest coverage ratio	2.50
Debt Instrument, Covenant, Maximum Net Leverage Ratio	3.50
Debt Instrument, Covenant, Maximum Secured Net Leverage Ratio	1.50