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
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Hedge margin liabilities $ 82   $ 82   $ 17
Income Tax Expense (Benefit)          
Income tax benefit (441) $ (735) (757) $ (1,279)  
Retained earnings 7,665   7,665   5,852
Accumulated other comprehensive loss (5,346) (4,202) (5,346) (4,202) (4,867)
Non-Current Investments and Restricted Cash 306   306   483
Operating Leases, Future Minimum Payments Due         1,637
Revenues 17,456 15,927 34,569 31,437  
Operating expenses $ 15,683 $ 13,890 $ 31,276 $ 27,783  
Restatement          
Income Tax Expense (Benefit)          
Retained earnings         735
Accumulated other comprehensive loss         $ 735