Investments (Summary Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 3,669	$ 3,416	$ 3,648
Current assets	1,069	887
Current liabilities	2,054	1,297
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Revenues	802	801	783
Operating income	357	376	359
Net income	358	343	$ 340
Current assets	112	121
Non-current assets	7,036	6,388
Current liabilities	455	317
Non-current liabilities	3,110	2,997
Noncontrolling interest	$ 247	$ 192