Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Cash Equivalents [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 1,685	$ 2,296	$ 1,488
Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 53	124	$ 254
Other Assets [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities		$ 27