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Stockholders' equity
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Stockholders' equity Stockholders’ equity
Stock repurchase program
Activity under our stock repurchase program, on a trade date basis, was as follows (in millions):
Years ended December 31,
202120202019
SharesDollarsSharesDollarsShares*Dollars
First quarter3.7 $865 4.3 $933 15.9 $3,031 
Second quarter6.5 1,592 2.6 591 13.1 2,349 
Third quarter4.6 1,069 3.0 752 6.2 1,170 
Fourth quarter6.9 1,461 5.3 1,221 5.1 1,090 
Total stock repurchases21.7 $4,987 15.2$3,497 40.2$7,640 
* Total shares do not add due to rounding.
In March 2021, October 2021 and December 2021, our Board of Directors increased the amount authorized under our stock repurchase program by an additional $3.4 billion, $4.5 billion and $5.0 billion, respectively. As of December 31, 2021, $10.9 billion remained available under our stock repurchase program.
Dividends
Our Board of Directors declared quarterly dividends per share of $1.76, $1.60 and $1.45, which were paid in each of the four quarters of 2021, 2020 and 2019, respectively.
Historically, we have declared dividends in December of each year, which were paid in the first quarter of the following fiscal year and in March, July and October, which were paid in the second, third and fourth quarters, respectively, of the same fiscal year. Additionally, on December 3, 2021, the Board of Directors declared a quarterly cash dividend of $1.94 per share of common stock, which will be paid on March 8, 2022, to all stockholders of record as of the close of business on February 15, 2022.
Accumulated other comprehensive loss
The components of AOCI were as follows (in millions):
Foreign
currency
translation		Cash flow
hedges		Available-for-sale
securities		OtherAOCI
Balance as of December 31, 2018$(670)$241 $(338)$(2)$(769)
Foreign currency translation adjustments(48)— — — (48)
Unrealized gains— 127 424 — 551 
Reclassification adjustments to income— (211)(56)— (267)
Other losses— — — (5)(5)
Income taxes— 18 (8)— 10 
Balance as of December 31, 2019(718)175 22 (7)(528)
Foreign currency translation adjustments9 — — — 9 
Unrealized (losses) gains— (61)6 — (55)
Reclassification adjustments to income— (501)(33)— (534)
Other losses— — — (7)(7)
Income taxes— 124 6 — 130 
Balance as of December 31, 2020(709)(263)1 (14)(985)
Foreign currency translation adjustments(135)— — — (135)
Unrealized gains (losses)— 159 (1)— 158 
Reclassification adjustments to income— 253 — — 253 
Other gains— — — 1 1 
Income taxes— (88)— — (88)
Balance as of December 31, 2021$(844)$61 $— $(13)$(796)
With respect to the table above, income tax expenses or benefits for unrealized gains and losses and the related reclassification adjustments to income for cash flow hedges were a $33 million expense and a $55 million expense in 2021, a $14 million benefit and a $110 million benefit in 2020 and a $28 million expense and a $46 million benefit in 2019, respectively. Income tax expenses or benefits for unrealized gains and losses and the related reclassification adjustments to income for available-for-sale securities were a $1 million expense and a $7 million benefit in 2020 and a $22 million expense and a $14 million benefit in 2019, respectively.
Reclassifications out of AOCI and into earnings were as follows (in millions):
Years ended December 31,
Components of AOCI202120202019Consolidated Statements of Income locations
Cash flow hedges:
Foreign currency contract (losses) gains$(8)$178 $101 Product sales
Cross-currency swap contract (losses) gains(245)323 110 Other income, net
(253)501 211 Income before income taxes
55 (110)(46)Provision for income taxes
$(198)$391 $165 Net income
Available-for-sale securities:
Net realized gains$— $33 $56 Other income, net
— (7)(14)Provision for income taxes
$— $26 $42 Net income
Other
In addition to common stock, our authorized capital includes 5 million shares of preferred stock, $0.0001 par value. As of December 31, 2021 and 2020, no shares of preferred stock were issued or outstanding.