Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Receivables:
Allowance for doubtful accounts receivable	$ 14	$ 9
Property, plant, and equipment:
Accumulated depreciation	386	355
PP&E owned by a VIE, net	29	35
Accumulated amortization	$ 184	$ 151
KBR shareholders’ equity:
Preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, shares issued (shares)	178,330,201	177,383,302
Common stock, shares outstanding (shares)	141,819,148	140,900,032
Treasury stock (shares)	36,511,053	36,483,270