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Share-Based Compensation - Stock Option Activity Table (Details)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended 12 Months Ended
Apr. 14, 2020
Apr. 13, 2020
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding, beginning balance (in shares options) | shares     90  
Granted (in shares options) | shares     0  
Exercised (in shares options) | shares     0  
Expired (in shares options) | shares     (21)  
Forfeited/canceled (in shares options) | shares     (47)  
Outstanding, ending balance (in shares options) | shares     22 90
Weighted Average Exercise Price Per Share(a)        
Outstanding, beginning (in dollars per share) | $ / shares     $ 1,420  
Granted (in dollars per share) | $ / shares     0  
Exercised (in dollars per share) | $ / shares     0  
Expired (in dollars per share) | $ / shares     893  
Forfeited/canceled (in dollars per share) | $ / shares     1,666  
Outstanding, ending (in dollars per share) | $ / shares     $ 1,390 $ 1,420
Weighted average contract life, outstanding     4 years 2 months 26 days 5 years 8 months 12 days
Aggregate intrinsic value, outstanding | $     $ 0 $ 0
Aggregate intrinsic value, exercised | $     $ 0  
Exercisable (in shares options) | shares     22  
Weighted average exercise price, exercisable (in dollars per share) | $ / shares     $ 1,400  
Weighted average contract life, exercisable (in years)     4 years 3 months 21 days  
Aggregate intrinsic value, exercisable | $     $ 0  
COMMON STOCK        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock split, conversion ratio 0.005 0.005