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Investments Summary of Significant Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summarized Financial Information for Significant Equity Investments [Line Items]
Percent of investee information represented	100.00%
Revenues	$ 4,703	$ 4,084	$ 3,857
Costs and expenses	3,398	3,056	3,408
Net income	1,305	1,028	$ 449
Current assets	956	892
Non-current assets	22,344	22,170
Current liabilities	1,241	3,532
Non-current liabilities	10,605	9,187
Partners’/owners’ equity	$ 11,454	$ 10,343

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