Quarterly report pursuant to Section 13 or 15(d)

RECENT ACCOUNTING PRONOUNCEMENTS - Narratives (Details)

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RECENT ACCOUNTING PRONOUNCEMENTS - Narratives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Tax Expense (Benefit)          
Income tax benefit $ (735) $ (683) $ (1,274) $ (1,299)  
Investment income 179 104 359 208  
Non-Current Investments and Restricted Cash 479   479   $ 476
Operating Leases, Future Minimum Payments Due         1,470
Revenues 15,750 14,629 31,065 29,047  
Operating expenses 13,534 $ 12,591 27,065 $ 25,186  
Self Insurance Program          
Income Tax Expense (Benefit)          
Non-Current Investments and Restricted Cash 112   112   310
Restatement          
Income Tax Expense (Benefit)          
Income tax benefit $ 7   $ 62    
Revenues         720
Operating expenses         $ (720)