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Recent Accounting Pronouncements (Narrative) (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 01, 2020
Dec. 31, 2019
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 2    
Net Income (Loss) Attributable to Parent $ (106) $ (207) $ (439) $ (228)    
Net income (loss) per basic common share $ (1.69) $ (2.45) $ (6.51) $ (2.68)    
Net income (loss) per diluted common share $ (1.69) $ (2.45) $ (6.51) $ (2.68)    
Retained Earnings (Accumulated Deficit) $ 126   $ 126     $ 607
ASU 2016-13 [Member]            
Retained Earnings (Accumulated Deficit)         $ 42  
ASU 2019-12 [Member] | Previously Reported [Member]            
Income Tax Expense (Benefit)   $ (37)   $ (39)    
Net Income (Loss) Attributable to Parent   $ (170)   $ (187)    
Net income (loss) per basic common share   $ (2.02)   $ (2.20)    
Net income (loss) per diluted common share   $ (2.02)   $ (2.20)