Fair Value Measurements (Financial Assets Carried at Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets:
Available-for-sale debt securities	$ 5	$ 11
Investment in equity securities	234	306
Cross-currency swap derivative contracts	291	653
Quoted Prices in Active Market (Level 1)
Assets:
Available-for-sale debt securities	0	0
Investment in equity securities	16	16
Cross-currency swap derivative contracts	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale debt securities	5	11
Investment in equity securities	0	0
Cross-currency swap derivative contracts	291	653
Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale debt securities	0	0
Investment in equity securities	0	0
Cross-currency swap derivative contracts	$ 0	$ 0