Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Cash Equivalents [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 1,414	$ 3,400	$ 1,602
Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	290	$ 86	49
cash and cash equivalents, marketable securities, and other current assets
Schedule of Held-to-maturity Securities [Line Items]
Available - for- sale securities			$ 65
Other Assets [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 53