Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parentheticals)

v3.10.0.1
Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Allowance for doubtful accounts $ 83 $ 91
Accumulated depreciation $ 1,244 $ 1,174
Common stock par value $ 0.01 $ 0.01
Common Stock, Shares Authorized 1 1