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Fair Value Disclosures (Estimated Fair Values and Carrying Amounts of Assets and Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value Disclosures [Abstract]    
Cash and cash equivalents $ 194 $ 105
Cash and cash equivalents, fair value 194 105
Restricted Cash and Cash Equivalents 177 176
Restricted Cash and Cash Equivalents Fair Value Disclosure 177 176
Long-term debt and other obligations, carrying amount 24,063 22,921
Long-term debt and other obligations, fair value $ 22,899 $ 21,201