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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net income (loss) $ (481,000,000) $ 62,000,000 $ (639,000,000) $ (29,000,000)
Basic weighted average shares outstanding 69,600 76,000 71,300 75,900
Basic $ (6.91) $ 0.81 $ (8.96) $ (0.39)
Diluted $ (6.91) $ 0.81 $ (8.96) $ (0.39)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted Average Number of Shares Outstanding, Diluted 69,600 76,400 71,300 75,900
Weighted Average Number Diluted Shares Outstanding Adjustment 0 400 0 0
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   500