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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 11 $ 8
Obsolescence allowance for aircraft fuel, spare parts and supplies 403 412
Accumulated amortization on intangibles $ 1,425 $ 1,380
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, authorized (in shares) 1,000,000,000 1,000,000,000
Common shares, outstanding (in shares) 253,624,406 269,914,769
United Airlines, Inc.    
Allowance for doubtful accounts $ 11 $ 8
Obsolescence allowance for aircraft fuel, spare parts and supplies 403 412
Accumulated amortization on intangibles $ 1,425 $ 1,380
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, authorized (in shares) 1,000 1,000
Common shares, issued (in shares) 1,000 1,000
Common shares, outstanding (in shares) 1,000 1,000