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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
ASU 2016-01 Recognition and Measurement of Financial Assets and Financial Liabilities | Maximum        
New Accounting Pronouncements or Change in Accounting Principle        
Approximate equity securities and cost method investments in aggregate $ 75   $ 75  
ASU 2017-07 Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost        
New Accounting Pronouncements or Change in Accounting Principle        
Amount of net periodic benefit costs (benefits) that will no longer be included within operating expenses once ASU No. 2017-07 is adopted. $ (31) $ (50) $ (95) $ (156)