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Nature of Operations and Basis of Presentation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Equity investments not accounted for under the equity method of accounting $ 528      
Interest income and other non-operating income, net 161 $ 85    
Decrease to Operating income $ (2,745) $ (1,972)    
Accounting Standards Update 2017-07 [Member] | Pro Forma [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Interest income and other non-operating income, net     $ 1,200 $ 380
Decrease to Operating income     $ 1,200 $ 380