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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