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Investments, Loans and Long-Term Receivables (Summary of Components of Investments, Loans, and Long-Term Receivables) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]    
Equity investments $ 13,102 $ 11,977
Loans and long-term receivables 334 84
Other investments 98 82
Total $ 13,534 $ 12,143