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
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Operating lease right-of-use assets $ 2,543     $ 0
Operating lease liability 2,585      
Hedge margin liabilities 383     325
Income Tax Expense (Benefit)        
Income tax benefit (329) $ (316)    
Retained earnings 8,249     8,006
Accumulated other comprehensive loss (4,818) (5,638)   (4,994)
Investments and Restricted Cash 169     170
Operating Leases, Future Minimum Payments Due       $ 2,967
Revenues 17,160 17,113    
Operating expenses $ 15,766 $ 15,593    
2016-02        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Operating lease right-of-use assets     $ 2,650  
Operating lease liability     $ 2,700