Fair Value Measurements (Financial Assets and Liabilities Carried at Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets:
Available-for-sale debt securities	$ 7	$ 11
Investment in equity securities	438	315
Cross-currency swap derivative contracts	497	653
Quoted Prices in Active Market (Level 1)
Assets:
Available-for-sale debt securities	0	0
Investment in equity securities	142	16
Cross-currency swap derivative contracts	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale debt securities	7	11
Investment in equity securities	0	0
Cross-currency swap derivative contracts	497	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