Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Total Amortized Cost	$ 22	$ 22
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	(22)	(1)
Fair Value, one to five years	81	81
Fair Value, Within One Year	21	21
Cash Equivalents [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,003	1,003	$ 1,746	$ 1,685
Marketable Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 99	$ 99	98	$ 53
Other Assets [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities			$ 55