Revenues from Contracts with Customers (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract with customer, liability	$ 258,000,000	$ 252,000,000
Revenue, performance obligation, description of timing	three days
Receivables	$ 71,000,000	48,000,000
Allowance for doubtful accounts, premiums and other receivables	$ 0	$ 0