Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Available - for- sale securities	$ 103
Cash Equivalents [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,011	$ 1,746	$ 780
Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 153	98	85
Other Assets [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities		$ 55	$ 27