Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts receivables and contract assets, allowance for doubtful accounts $ 25 $ 21
Preferred Stock    
Equity:    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares issued 0 0
Series A    
Equity:    
Common stock, par value per share $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock shares issued 72,152,848 72,146,903
Common stock, shares outstanding 72,152,848 72,146,903
Series B    
Equity:    
Common stock, par value per share $ 0.01 $ 0.01
Common stock, shares authorized 7,500,000 7,500,000
Common stock shares issued 2,929,401 2,929,777
Common stock, shares outstanding 2,929,401 2,929,777
Series C    
Equity:    
Common stock, par value per share $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock shares issued 0 0