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POST-EMPLOYMENT BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2021
Employee Benefits [Abstract]  
Disclosure of net defined benefit liability (asset) The following table shows the changes in the present value of the defined benefit pension plan and post-employment plan obligations and the fair values of plan assets as at December 31, 2021:
Defined benefit pension planPost-employment plan
(US$ MILLIONS)2021202020212020
Changes in defined benefit obligation
Defined benefit obligation at beginning of year$3,308 $2,927 $104 $106 
Defined benefit obligation through business combinations107 88 6 (1)
Service cost33 35 2 3 
Interest cost67 83 2 3 
Participant contributions2 2 3 4 
Foreign currency exchange differences(218)43 (17)(1)
Actuarial (gain) loss due to financial assumption changes(123)297 (6)6 
Actuarial (gain) loss due to demographic assumption changes15 (27)(10)— 
Actuarial experience adjustments16 14 (12)(5)
Benefits paid from plan assets(157)(121)(1)(3)
Benefits paid from employer(16)(33)(6)(8)
Defined benefit obligation at end of year$3,034 3,308 $65 104 
Changes in fair value of plan assets
Fair value of plan assets at beginning of year$(2,391)$(2,194)$(3)$(4)
Fair value of plan assets through business combinations(7)(62)— — 
Interest income(47)(61)— — 
Return on plan assets (excluding interest income)(225)(147)— — 
Foreign currency exchange differences152 (23)— — 
Employer contributions(64)(65)(4)(2)
Participant contributions(2)(2)(3)(2)
Employer direct settlements1 — — — 
Benefits paid from plan assets157 119 1 (1)
Benefits paid from employer16 32 6 6 
Administrative expenses paid from plan assets10 11 — — 
Insurance premiums for risk benefits— 1 — — 
Fair value of plan assets at end of year$(2,400)$(2,391)$(3)$(3)
Net asset at end of year $(75)— $— $— 
Net liability at end of year$709 $917 $62 $101 
The following table summarizes the defined benefit pension plan and post-employment plan obligations and the fair values of plan assets by geography as at December 31, 2021:
(US$ MILLIONS)United States of AmericaCanadaOtherTotal
Defined benefit pension plan
Defined benefit obligation$2,216 $20 $798 $3,034 
Fair value of plan assets(1,867)— (533)(2,400)
Net liability$349 $20 $265 $634 
Post-employment benefits
Defined benefit obligation$42 $12 $11 $65 
Fair value of plan assets(3)— — (3)
Net liability$39 $12 $11 $62 
    The following table summarizes the defined benefit pension plan and post-employment plan obligations and the fair values of plan assets by geography as at December 31, 2020:
(US$ MILLIONS)United States of AmericaCanadaOtherTotal
Defined benefit pension plan
Defined benefit obligation$2,581 $28 $699 $3,308 
Fair value of plan assets(1,911)— (480)(2,391)
Net liability$670 $28 $219 $917 
Post-employment benefits
Defined benefit obligation$64 $26 $14 $104 
Fair value of plan assets(3)— — (3)
Net liability$61 $26 $14 $101 
    Amounts recognized in respect of these defined benefit and post-employment plans during the year are as follows:
Defined benefit pension planPost-employment
plan
(US$ MILLIONS)2021202020212020
Amounts recognized in profit and loss
Current service cost$41 $35 $2 $3 
Past service cost (8)— — — 
Net interest expense20 22 2 3 
Administrative expense10 11 — — 
Total expense recognized in profit and loss$63 $68 $4 $6 
Amounts recognized in other comprehensive income
Return on plan assets (excluding amounts included in net interest expense)$(225)$(147)$— $— 
Actuarial (gains) and losses arising from changes in demographic assumptions15 (27)(10)— 
Actuarial (gains) and losses arising from changes in financial assumptions(123)297 (6)6 
Actuarial (gains) and losses arising from experience adjustments16 14 (12)(5)
Total expense (gain) recognized in other comprehensive income$(317)$137 $(28)$1 
Total expense (gain) recognized in comprehensive income$(254)$205 $(24)$7 
Disclosure of fair value of plan assets The following table summarizes the fair value of plan assets by category and level in the fair value hierarchy as at December 31, 2021:
(US$ MILLIONS)Level 1
Level 2 (1)
Level 3 (2)
Total
Cash and cash equivalents$45 $7 $— $52 
Equity instruments69 833 — 902 
Debt instruments275 946 105 1,326 
Real Estate— 106 — 106 
Fixed insurance contracts16 $1 — 17 
Total plan assets$405 $1,893 $105 $2,403 
____________________________________
(1)Level 2 assets represent the net asset value of the underlying assets held within an investment fund. The assets are valued by the fund administrator.
(2)Level 3 assets consist of debt instruments held within an investment fund. The assets are valued using non-observable inputs by the plan administrator.
    The following table summarizes the fair value of plan assets by category and level in the fair value hierarchy as at December 31, 2020:
(US$ MILLIONS)Level 1
Level 2 (1)
Level 3 (2)
Total
Cash and cash equivalents$21 $7 $— $28 
Equity instruments1,294 306 6 1,606 
Debt instruments13 400 160 573 
Real Estate— 52 3 55 
Derivatives— — 2 2 
Investment funds— — 113 113 
Fixed insurance contracts11 — 6 17 
Total plan assets$1,339 $765 $290 $2,394 
____________________________________
(1)Level 2 assets represent the net asset value of the underlying assets held within an investment fund. The assets are valued by the fund administrator.
(2)Level 3 assets consist of insurance rights and equity and debt instruments held within an investment fund. The assets are valued using non-observable inputs by the plan administrator.
Disclosure of defined benefit plans and significant assumptions The significant actuarial assumptions adopted are as follows:
Defined benefit plan
20212020
Discount rate
0.2% to 8.0%
0.2% to 8.0%
Rate of compensation increase
0.0% to 5.0%
0.0% to 5.0%
Post-employment plan
20212020
Discount rate
0.9% to 11.2%
0.9% to 11.2%
Health care cost trend on covered charges:
Immediate trend rate
3.5% to 8.0%
3.5% to 8.0%
Ultimate trend rate
3.5% to 8.0%
3.5% to 8.0%
Disclosure of sensitivity analysis for actuarial assumptions The following table presents a sensitivity analysis of each assumption with the related impact on these liabilities as at December 31, 2021:
(US$ MILLIONS, except as noted)Percentage increaseImpact on liabilityPercentage decreaseImpact on liability
Defined benefit pension plan
Discount rate1%$(387)1%$473
Rate of compensation increase1%381%(34)
Post-employment plan
Discount rate1%$(6)1%$7
Health care cost trend rates1%11%(1)
    The following table presents a sensitivity analysis of each assumption with the related impact on these liabilities as at December 31, 2020:
(US$ MILLIONS, except as noted)Percentage increaseImpact on liabilityPercentage decreaseImpact on liability
Defined benefit pension plan
Discount rate1%$(472)1%$528
Rate of compensation increase1%$601%$(44)
Post-employment plan
Discount rate1%$(9)1%$11
Health care cost trend rates1%$21%$(1)
Disclosure of future planned benefit payments under post-employment benefit plans The following table summarizes future planned benefit payments under the partnership’s defined benefit and post-employment plans as at December 31, 2021:
(US$ MILLIONS)Defined benefit pension planPost-employment planTotal
2022$122 $4 $126 
2023123 4 127 
2024128 3 131 
2025130 3 133 
2026133 3 136 
Thereafter3,967 80 4,047 
Total$4,603 $97 $4,700