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Accumulated Other Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table provides information about the changes in each component of accumulated other comprehensive income.

Defined benefit plansForeign currency translationGains and losses on cash flow hedgesTotal
Balance at January 1, 2020$(1,449)$(1,668)$(14)$(3,131)
Other comprehensive income / (loss) before reclassifications206 (316)(39)(149)
Amounts reclassified from accumulated other comprehensive income51 — 58 
Other comprehensive income / (loss)257 (316)(32)(91)
Balance at March 31, 2020$(1,192)$(1,984)$(46)$(3,222)
Balance at January 1, 2021$(1,464)$(1,759)$30 $(3,193)
Other comprehensive (loss) / income before reclassifications— (34)25 (9)
Amounts reclassified from accumulated other comprehensive income15 — (11)
Other comprehensive income / (loss)15 (34)14 (5)
Balance at March 31, 2021$(1,449)$(1,793)$44 $(3,198)

See Note K and Note M for further details of amounts related to cash flow hedges and defined benefit plans.