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Stockholders' equity (Tables)
6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Schedule of Changes in Stockholders' Equity
Changes in equity are as follows:
Common StockPaid-in CapitalRetained EarningsTreasury Common StockAOCI
Balance, December 31, 2020$1,741 $2,333 $42,051 $(36,578)$(360)
2021
Net income— — 1,753 — — 
Dividends declared and paid ($1.02 per share)
— — (940)— — 
Common stock issued for stock-based awards— (3)— 199 — 
Stock repurchases— — — (100)— 
Stock compensation— 61 — — — 
Other comprehensive income (loss), net of taxes— — — — 13 
Dividend equivalents on RSUs— — (4)— — 
Balance, March 31, 20211,741 2,391 42,860 (36,479)(347)
Net income  1,931   
Dividends declared and paid ($1.02 per share)
  (942)  
Common stock issued for stock-based awards 25  29  
Stock repurchases   (146) 
Stock compensation 69    
Other comprehensive income (loss), net of taxes    24 
Dividend equivalents on RSUs  (4)  
Other  1   
Balance, June 30, 2021$1,741 $2,485 $43,846 $(36,596)$(323)
 
Common StockPaid-in CapitalRetained EarningsTreasury Common StockAOCI
Balance, December 31, 2019$1,741 $2,110 $39,898 $(34,495)$(347)
2020
Net income— — 1,174 — — 
Dividends declared and paid ($0.90 per share)
— — (841)— — 
Common stock issued for stock-based awards— (77)— 223 — 
Stock repurchases— — — (1,730)— 
Stock compensation— 63 — — — 
Other comprehensive income (loss), net of taxes— — — — 19 
Dividend equivalents on RSUs— — (4)— — 
Balance, March 31, 20201,741 2,096 40,227 (36,002)(328)
Net income— — 1,380 — — 
Dividends declared and paid ($0.90 per share)
— — (823)— — 
Common stock issued for stock-based awards— 17 — 70 — 
Stock repurchases— — — (793)— 
Stock compensation— 69 — — — 
Other comprehensive income (loss), net of taxes— — — — (6)
Dividend equivalents on RSUs— — (4)— — 
Balance, June 30, 2020$1,741 $2,182 $40,780 $(36,725)$(334)