Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parentheticals)

v3.21.2
Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Allowance for doubtful accounts $ 94 $ 124
Accumulated depreciation $ 1,433 $ 1,544
Common stock par value $ 0.01 $ 0.01
Common Stock, Shares Authorized 1 1