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Stockholders' equity (Tables)
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Summary of activity under our stock repurchase program
Activity under our stock repurchase program, on a trade date basis, was as follows (in millions):
20212020
 SharesDollars SharesDollars
First quarter3.7 $865 4.3 $933 
Second quarter6.5 1,592 2.6 591 
Third quarter4.6 1,069 3.0 752 
Total stock repurchases14.8 $3,526 9.9 $2,276 
Components of accumulated other comprehensive income
The components of Accumulated other comprehensive income (loss) (AOCI) were as follows (in millions):
Foreign
currency
translation		Cash flow
hedges		Available-for-sale
securities		OtherAOCI
Balance as of December 31, 2020$(709)$(263)$1 $(14)$(985)
Foreign currency translation adjustments(39)— — — (39)
Unrealized gains— 108 — — 108 
Reclassification adjustments to income— 133 — — 133 
Other— — — 1 1 
Income taxes— (51)— — (51)
Balance as of March 31, 2021
(748)(73)1 (13)(833)
Foreign currency translation adjustments14 — — — 14 
Unrealized losses— (31)— — (31)
Reclassification adjustments to income— (28)— — (28)
Other— — — (1)(1)
Income taxes— 11 — — 11 
Balance as of June 30, 2021
(734)(121)1 (14)(868)
Foreign currency translation adjustments(35)— — — (35)
Unrealized gains (losses)— 16 (1)— 15 
Reclassification adjustments to income— 109 — — 109 
Other— — — (3)(3)
Income taxes— (26)— — (26)
Balance as of September 30, 2021
$(769)$(22)$— $(17)$(808)
Reclassifications out of accumulated other comprehensive income
Reclassifications out of AOCI and into earnings, including related income tax expenses, were as follows (in millions):
Three months ended September 30,
Components of AOCI20212020Condensed Consolidated
Statements of Income locations
Cash flow hedges:
Foreign currency contract (losses) gains$(5)$41 Product sales
Cross-currency swap contract (losses) gains(104)183 Other income, net
(109)224 Income before income taxes
23 (49)Provision for income taxes
$(86)$175 Net income
Available-for-sale securities:
Net realized gains$— $— Other income, net
— — Provision for income taxes
$— $— Net income
Nine months ended September 30,
Components of AOCI20212020Condensed Consolidated
Statements of Income locations
Cash flow hedges:
Foreign currency contract (losses) gains$(24)$158 Product sales
Cross-currency swap contract (losses) gains(190)101 Other income, net
(214)259 Income before income taxes
45 (57)Provision for income taxes
$(169)$202 Net income
Available-for-sale securities:
Net realized gains$— $33 Other income, net
— (7)Provision for income taxes
$— $26 Net income