Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Surrender Value, Fair Value Disclosure	$ 31	$ 30
Long-term Debt	4,433	3,985
Unamortized Debt Issuance Expense	15	14
Long-term Debt, Fair Value	$ 3,955	$ 3,705