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Stockholders’ equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning |  |  | $ 8,994 |  |  |  | $ 8,994 |
Net income | $ 1,425 |  |  | $ 1,570 |  |  | 3,947 | $ 4,341
Other comprehensive income (loss), net of taxes | 14 |  |  | 17 |  |  | 30 | 30
Balance, ending | 8,985 |  |  |  |  |  | 8,985 |
Common Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning | 1,741 | $ 1,741 | 1,741 | 1,741 | $ 1,741 | $ 1,741 | 1,741 | 1,741
Net income | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock repurchases | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock compensation | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cumulative effect of accounting changes |  |  |  |  |  | 0 |  |
Other | 0 | 0 | 0 | 0 | 0 | 0 |  |
Balance, ending | 1,741 | 1,741 | 1,741 | 1,741 | 1,741 | 1,741 | 1,741 | 1,741
Paid-in Capital |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning | 2,003 | 1,927 | 1,950 | 1,867 | 1,770 | 1,776 | 1,950 | 1,776
Net income | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 8 | 10 | (84) | 6 | 22 | (75) |  |
Stock repurchases | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock compensation | 48 | 67 | 61 | 46 | 74 | 70 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cumulative effect of accounting changes |  |  |  |  |  | 0 |  |
Other | (1) | (1) | 0 | (1) | 1 | (1) |  |
Balance, ending | 2,058 | 2,003 | 1,927 | 1,918 | 1,867 | 1,770 | 2,058 | 1,918
Retained Earnings |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning | 38,974 | 38,396 | 37,906 | 36,413 | 35,619 | 34,662 | 37,906 | 34,662
Net income | 1,425 | 1,305 | 1,217 | 1,570 | 1,405 | 1,366 |  |
Dividends declared and paid | (721) | (722) | (724) | (602) | (606) | (611) |  |
Common stock issued for stock-based awards | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock repurchases | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock compensation | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | (4) | (4) | (4) | (4) | (5) | (4) |  |
Cumulative effect of accounting changes |  |  |  |  |  | 206 |  |
Other | 0 | (1) | 1 | 1 | 0 | 0 |  |
Balance, ending | 39,674 | 38,974 | 38,396 | 37,378 | 36,413 | 35,619 | 39,674 | 37,378
Treasury Common Stock |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning | (33,775) | (33,080) | (32,130) | (29,016) | (28,096) | (27,458) | (32,130) | (27,458)
Net income | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 186 | 136 | 235 | 49 | 80 | 253 |  |
Stock repurchases | (456) | (830) | (1,185) | (1,200) | (1,000) | (891) |  |
Stock compensation | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cumulative effect of accounting changes |  |  |  |  |  | 0 |  |
Other | 0 | (1) | 0 | 0 | 0 | 0 |  |
Balance, ending | (34,045) | (33,775) | (33,080) | (30,167) | (29,016) | (28,096) | (34,045) | (30,167)
AOCI |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning | (457) | (465) | (473) | (371) | (392) | (384) | (473) | (384)
Net income | 0 | 0 | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock repurchases | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock compensation | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | 14 | 8 | 8 | 17 | 21 | (8) |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cumulative effect of accounting changes |  |  |  |  |  | 0 |  |
Other | 0 | 0 | 0 | 0 | 0 | 0 |  |
Balance, ending | $ (443) | $ (457) | $ (465) | $ (354) | $ (371) | $ (392) | $ (443) | $ (354)

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