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Marketable Securities Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Marketable Securities [Line Items]        
Cash and cash equivalents $ 12,864 $ 12,960    
Restricted cash 2,700 2,218    
Total 15,546 $ 15,160 $ 17,163 $ 17,332
Other current assets [Member]        
Marketable Securities [Line Items]        
Restricted cash 2,103      
Other assets [Member]        
Marketable Securities [Line Items]        
Restricted cash $ 579