Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Cash Equivalents [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 1,746	$ 2,296
Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	98	124
Other Assets [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 55	$ 27