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Accumulated Other Comprehensive Earnings
 12 Months Ended
Dec. 31, 2021
Disclosure of analysis of other comprehensive income by item [abstract]  
Accumulated Other Comprehensive Earnings Accumulated Other Comprehensive Earnings
The components of, and changes in, accumulated other comprehensive earnings are as follows:
 20212020
Currency translation adjustment  
Opening balance, Jan. 1(21)(21)
Losses on translating net assets of foreign operations, net of reclassifications to net earnings,
   net of tax		(14)(11)
Gains on financial instruments designated as hedges of foreign operations, net of
   reclassifications to net earnings, net of tax
— 11 
Balance, Dec. 31(35)(21)
Cash flow hedges  
Opening balance, Jan. 1436 527 
Losses on derivatives designated as cash flow hedges, net of reclassifications to net earnings and
   to non-financial assets, net of tax(1)
(208)(91)
Balance, Dec. 31228 436 
Employee future benefits  
Opening balance, Jan. 1(66)(55)
Net actuarial gains (losses) on defined benefit plans, net of tax(2)
37 (11)
Balance, Dec. 31(29)(66)
Other  
Opening balance, Jan. 1(47)3 
Intercompany investments at FVOCI29 (50)
Balance, Dec. 31(18)(47)
Accumulated other comprehensive earnings146 302 
(1) Net of income tax of $57 million for the year ended Dec. 31, 2021 (2020 — $23 million).
(2) Net of income tax of $11 million for the year ended Dec. 31, 2021 (2020 — $3 million).