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Share-Based Compensation Plans (Schedule of Summary of Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Shares    
Outstanding, beginning balance (in shares) 18,962  
Granted (in shares) 4,755  
Exercised (in shares) (3,071)  
Forfeited (in shares) (3,242)  
Expired (in shares) (2,525)  
Outstanding, ending balance (in shares) 14,878 18,962
Exercisable, Shares (in shares) 8,832  
Weighted-Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 9.05  
Granted (in dollars per share) 3.43  
Exercised (in dollars per share) 5.07  
Forfeited (in dollars per share) 5.33  
Expired (in dollars per share) 14.84  
Outstanding, ending balance, (in dollars per share) 7.91 $ 9.05
Exercisable, weighted-average exercise price (in dollars per share) $ 10.61  
Outstanding, weighted-average contractual term, years 7 years 6 months
Outstanding, exercisable, weighted-average contractual term, years 6 years 3 months 18 days  
Outstanding, aggregate intrinsic value $ 21,766.0
Exercisable, aggregate intrinsic value $ 4,223.0