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Investments (Summary Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 3,416	$ 3,648	$ 3,534
Current assets	887	876
Current liabilities	1,297	2,054
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Revenues	801	783	724
Operating income	376	359	325
Net income	343	340	$ 217
Current assets	121	139
Non-current assets	6,388	5,964
Current liabilities	317	507
Non-current liabilities	2,997	2,659
Noncontrolling interest	$ 192	$ 208

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