XML 101 R78.htm IDEA: XBRL DOCUMENT v3.20.4
Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Available for future grants (in shares) 8,995,582    
Amended LTIP plan-award granted as an option or stock appreciation right (in shares) 1    
Amended LTIP plan - award granted in a form other than option or stock appreciation right (in shares) 1.61    
Aggregate intrinsic value of options outstanding $ 213    
Weighted average remaining contractual term of options outstanding 4 years 7 months 6 days    
Number of shares exercisable (in shares) 1,220,685    
Aggregate intrinsic value of options exercisable $ 183    
Exercisable weighted average exercise price (in dollars per share) $ 87.75    
Weighted average remaining contractual term of options exercisable 2 years 10 months 24 days    
Unrecognized compensation related to stock options granted $ 5    
LTIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares available for grant (in shares) 104,125,000    
Available for future grants (in shares) 8,995,582 9,294,726 8,644,108
LTIP dividend equivalent payment, in years 4 years    
Dividend yield for period dividend equivalents paid 1.76% 2.06% 1.94%
Unrecognized compensation related to stock options granted $ 1    
Unrecognized compensation, weighted average period of recognition 2 years 4 months 24 days    
LTIP options during vesting period      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield for period dividend equivalents paid 0.00%    
TSOP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares available for grant (in shares) 6,000,000    
Available for future grants (in shares) 435,699 434,401 422,973
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation related to stock options granted $ 29    
Unrecognized compensation, weighted average period of recognition 2 years 4 months 24 days    
Performance Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation, weighted average period of recognition 1 year 8 months 12 days    
PSU Cycle 3 years    
Grant Date, 2019 | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Grant Date, 2018 | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Grant Date, 2017 | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 5 years    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 1 year    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period (in years) 10 years