Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Recurring
Transfers into or out of Level 1 or Level 2 or Level 3	$ 0	$ 0
Liabilities recorded at fair value	1,322	1,799
Nonrecurring
Liabilities recorded at fair value	$ 0	$ 0