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Investments, Loans and Long-Term Receivables (Summary of Financial Information for Equity Method Investments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of financial information      
Revenues $ 30,605 $ 33,126 $ 57,979
Income before income taxes 3,206 3,180 4,791
Net income 2,960 3,158 4,700
Current assets 7,097 6,024 7,402
Noncurrent assets 50,163 46,047 41,271
Current liabilities 5,173 4,130 6,854
Noncurrent liabilities 13,709 11,493 9,736
Noncontrolling interests $ 2,260 $ 2,404 $ 2,584