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Consolidated Statements of Changes In Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated other comprehensive loss
Retained Income
Balance at Beginning of Year at Dec. 31, 2017 $ 16,359 $ 285 $ 2,254 $ (356) $ 14,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 2,666       2,666
Other comprehensive income (loss) (119)     (119)  
Total comprehensive income 2,547        
Dividends on Common Stock ($3.04, $3.60 and $3.76 for years ended 2018, 2019 and 2020, respectively) (844)       (844)
Share repurchases (2,781) (17) (125)   (2,639)
Stock-based compensation 81 1 87   (7)
Reclassification of stranded tax effects 0     (88) 88
Balance at End of Year at Dec. 31, 2018 15,362 269 2,216 (563) 13,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 2,722       2,722
Other comprehensive income (loss) 72     72  
Total comprehensive income 2,794        
Dividends on Common Stock ($3.04, $3.60 and $3.76 for years ended 2018, 2019 and 2020, respectively) (949)       (949)
Share repurchases (2,099) (11) (88)   (2,000)
Stock-based compensation 76 1 81   (6)
Balance at End of Year at Dec. 31, 2019 15,184 259 2,209 (491) 13,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 2,013       2,013
Other comprehensive income (loss) (103)     (103)  
Total comprehensive income 1,910        
Dividends on Common Stock ($3.04, $3.60 and $3.76 for years ended 2018, 2019 and 2020, respectively) (960)       (960)
Share repurchases (1,439) (7) (59)   (1,373)
Stock-based compensation 96 2 98   (4)
Balance at End of Year at Dec. 31, 2020 $ 14,791 $ 254 $ 2,248 $ (594) $ 12,883