Investments (Summary Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 4,027	$ 4,205	$ 3,669
Current assets	1,272	1,250
Current liabilities	2,304	2,363
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Revenues	898	813	802
Operating income	384	350	357
Net income	370	675	$ 358
Current assets	221	227
Non-current assets	9,032	8,292
Current liabilities	528	620
Non-current liabilities	3,584	3,285
Noncontrolling interest	$ 259	$ 289