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 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Tax Expense (Benefit)          
Income tax benefit $ (680) $ (683) $ (1,954) $ (1,982)  
Investment income 216 105 575 313  
Non-Current Investments and Restricted Cash 481   481   $ 476
Operating Leases, Future Minimum Payments Due         1,470
Revenues 15,978 14,928 47,043 43,975  
Operating expenses 13,943 12,894 41,008 $ 38,080  
Self Insurance Program          
Income Tax Expense (Benefit)          
Non-Current Investments and Restricted Cash $ 123   123   310
Restatement          
Income Tax Expense (Benefit)          
Income tax benefit   $ 0 $ 62    
Revenues         720
Operating expenses         $ (720)