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Capital Stock and Stock-Based Compensation Plans - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Jun. 18, 2018
USD ($)
May 10, 2013
plan
Preference Stock [Abstract]          
Shares authorized (in shares) | shares 50,262,150        
Stock Repurchases [Abstract]          
Repurchased stock $ 1,238 $ 1,399 $ 1,335    
Stock-Based Compensation [Abstract]          
Number of stockholder approved plans, current | plan         1
Total stock-based compensation expense charged against pretax income 109 127 123    
Total income tax benefit from stock compensation $ 25 $ 42 $ 40    
Weighted-average estimated fair value of stock options granted (in dollars per share) | $ / shares $ 9.48 $ 8.37 $ 8.10    
Stock-based compensation, additional disclosures [Abstract]          
Tax benefit from exercise of stock options and vesting of restricted stock unit awards $ 12 $ 47 $ 59    
Proceeds from exercise of stock options $ 329 507 386    
Incentive Stock Plans          
Additional disclosures pertaining to stock based compensation [Abstract]          
Vesting period (in years) 3 years        
Number of shares available for grant (in shares) | shares 9,186,000        
Unrecognized compensation expense $ 45        
Unrecognized compensation expense, weighted-average period of recognition in years 2 years 1 month 6 days        
Total fair value of shares vested $ 55 66 61    
Stock Option Plans          
Additional disclosures pertaining to stock based compensation [Abstract]          
Vesting period (in years) 3 years        
Number of shares available for grant (in shares) | shares 15,604,000        
Unrecognized compensation expense $ 38        
Unrecognized compensation expense, weighted-average period of recognition in years 1 year 6 months        
Stock-based compensation, additional disclosures [Abstract]          
Contractual term (in years) 6 years        
Total intrinsic value of options exercised $ 92 $ 201 $ 221    
Program 2018          
Stock Repurchases [Abstract]          
Stock repurchase program, authorized amount       $ 5,000