Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Details 4)

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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Details 4) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other Fair Value Disclosures [Abstract]    
Long-term Debt $ 30,361 $ 34,480
Long-term Debt, Fair Value $ 30,438 $ 35,169