Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parentheticals)

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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Allowance for doubtful accounts $ 84 $ 97
Accumulated depreciation $ 1,161 $ 1,004
Common stock par value $ 0.01 $ 0.01
Common Stock, Shares Authorized 1 1