Borrowings and Other Debt Obligations - Narrative (Details) $ in Millions	Jun. 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	$ 389			$ 376
Performance Letters of Credit
Short-term Debt [Line Items]
Letters of credit outstanding, amount	289			218
Financial Letters of Credit
Short-term Debt [Line Items]
Letters of credit outstanding, amount	48			52
Uncommitted Letters of Credit
Short-term Debt [Line Items]
Letters of credit outstanding, amount	52			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
LC Credit Agreement Letters of Credit
Short-term Debt [Line Items]
Face amount of debt	$ 0			$ 0