Annual report pursuant to Section 13 and 15(d)

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3)

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BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) - Allowance for doubtful accounts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Activity in the allowance for doubtful accounts      
Balance at beginning of year $ 466 $ 352 $ 331
Net charges to costs and expenses 32 126 45
Write-offs (10) (10) (10)
Other (11) (2) (14)
Balance at end of year $ 477 $ 466 $ 352