Investments and Other Assets (Summary of Credit Loss Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 83	$ 100
Credit loss (recovery), net	(12)	(10)
Write-offs	(22)	(7)
Ending balance	$ 49	$ 83