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
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Hedge margin liabilities $ 59   $ 59   $ 17
Income Tax Expense (Benefit)          
Income tax benefit (381) $ (678) (1,138) $ (1,957)  
Retained earnings 8,377   8,377   5,852
Accumulated other comprehensive loss (5,288) (4,224) (5,288) (4,224) (4,867)
Non-Current Investments and Restricted Cash 307   307   483
Operating Leases, Future Minimum Payments Due         1,637
Revenues 17,444 16,173 52,013 47,610  
Operating expenses $ 15,717 $ 14,361 $ 46,993 $ 42,144  
Restatement          
Income Tax Expense (Benefit)          
Retained earnings         735
Accumulated other comprehensive loss         $ 735