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Stockholders' equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning |  | $ 8,907 |  |  | $ 8,907 |
Net income | $ 1,380 |  | $ 1,305 |  | 2,554 | $ 2,522
Other comprehensive income (loss), net of taxes | (6) |  | 8 |  | 13 | 16
Balance, ending | 7,644 |  |  |  | 7,644 |
Common Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning | 1,741 | 1,741 | 1,741 | $ 1,741 | 1,741 | 1,741
Net income | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 0 | 0 | 0 | 0 |  |
Stock repurchases | 0 | 0 | 0 | 0 |  |
Stock compensation | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 |  |
Other |  |  | 0 | 0 |  |
Balance, ending | 1,741 | 1,741 | 1,741 | 1,741 | 1,741 | 1,741
Paid-in Capital |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning | 2,096 | 2,110 | 1,927 | 1,950 | 2,110 | 1,950
Net income | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 17 | (77) | 10 | (84) |  |
Stock repurchases | 0 | 0 | 0 | 0 |  |
Stock compensation | 69 | 63 | 67 | 61 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 |  |
Other |  |  | (1) | 0 |  |
Balance, ending | 2,182 | 2,096 | 2,003 | 1,927 | 2,182 | 2,003
Retained Earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning | 40,227 | 39,898 | 38,396 | 37,906 | 39,898 | 37,906
Net income | 1,380 | 1,174 | 1,305 | 1,217 |  |
Dividends declared and paid | (823) | (841) | (722) | (724) |  |
Common stock issued for stock-based awards | 0 | 0 | 0 | 0 |  |
Stock repurchases | 0 | 0 | 0 | 0 |  |
Stock compensation | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | (4) | (4) | (4) | (4) |  |
Other |  |  | (1) | 1 |  |
Balance, ending | 40,780 | 40,227 | 38,974 | 38,396 | 40,780 | 38,974
Treasury Common Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning | (36,002) | (34,495) | (33,080) | (32,130) | (34,495) | (32,130)
Net income | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 70 | 223 | 136 | 235 |  |
Stock repurchases | (793) | (1,730) | (830) | (1,185) |  |
Stock compensation | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0 |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 |  |
Other |  |  | (1) | 0 |  |
Balance, ending | (36,725) | (36,002) | (33,775) | (33,080) | (36,725) | (33,775)
AOCI |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance, beginning | (328) | (347) | (465) | (473) | (347) | (473)
Net income | 0 | 0 | 0 | 0 |  |
Dividends declared and paid | 0 | 0 | 0 | 0 |  |
Common stock issued for stock-based awards | 0 | 0 | 0 | 0 |  |
Stock repurchases | 0 | 0 | 0 | 0 |  |
Stock compensation | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss), net of taxes | (6) | 19 | 8 | 8 |  |
Dividend equivalents on RSUs | 0 | 0 | 0 | 0 |  |
Other |  |  | 0 | 0 |  |
Balance, ending | $ (334) | $ (328) | $ (457) | $ (465) | $ (334) | $ (457)

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