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Pension and Other Benefit Plans (Tables)
12 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Projected Benefit Obligations
As of
(in millions)March 31, 2021March 31, 2020
Projected benefit obligation at beginning of year$10,150 $11,016 
Service cost91 92 
Interest cost245 237 
Plan participants’ contributions31 30 
Amendments(9)— 
Business/contract acquisitions/divestitures11 12 
Contractual termination benefits13 10 
Settlement/curtailment(37)(60)
Actuarial loss (gain)1,262 (362)
Benefits paid(393)(359)
Foreign currency exchange rate changes1,084 (457)
Other(12)(9)
Projected benefit obligation at end of year$12,436 $10,150 
The following table summarizes the weighted average rates used in the determination of the Company’s benefit obligations:
Fiscal Years Ended
March 31, 2021March 31, 2020
Discount rate2.0 %2.4 %
Rates of increase in compensation levels2.5 %1.6 %
Interest Crediting Rate4.0 %N/A

Fair Value of Plan Assets and Funded Status
As of
(in millions)March 31, 2021March 31, 2020
Fair value of plan assets at beginning of year$11,090 $11,343 
Actual return on plan assets1,401 526 
Employer contribution117 108 
Plan participants’ contributions31 30 
Benefits paid(393)(359)
Business/contract acquisitions/divestitures— 
Contractual termination benefits15 
Plan settlement(31)(63)
Foreign currency exchange rate changes1,224 (507)
Other(21)(10)
Fair value of plan assets at end of year$13,425 $11,090 
Funded status at end of year$989 $940 


Selected Information
As of
(in millions)March 31, 2021March 31, 2020
Other assets$1,884 $1,735 
Accrued expenses and other current liabilities(81)(16)
Non-current pension obligations (796)(761)
Other long-term liabilities - OPEB(18)(18)
Net amount recorded$989 $940 
Accumulated benefit obligation$12,346 $10,072 

Benefit Plans with Projected Benefit Obligation in Excess of Plan Assets Benefit Plans with Accumulated Benefit Obligation in Excess of Plan Assets
(in millions)March 31, 2021March 31, 2020March 31, 2021March 31, 2020
Projected benefit obligation$2,490 $2,191 $2,453 $2,159 
Accumulated benefit obligation$2,431 $2,131 $2,402 $2,108 
Fair value of plan assets$1,596 $1,397 $1,562 $1,369 
Net Periodic Pension Cost
Fiscal Years Ended
(in millions)
March 31, 2021March 31, 2020March 31, 2019
Service cost
$91 $92 $88 
Interest cost
245 237 253 
Expected return on assets
(659)(651)(570)
Amortization of transition obligation
— — — 
Amortization of prior service costs
(8)(9)(15)
Contractual termination benefit
13 10 
Settlement/curtailment (gain) loss(18)(10)
Recognition of actuarial loss (gain)537 (252)153 
Net periodic pension expense (income)$201 $(566)$(98)
The weighted-average rates used to determine net periodic pension cost were:
Fiscal Years Ended
March 31, 2021March 31, 2020March 31, 2019
Discount or settlement rates2.4 %2.4 %2.5 %
Expected long-term rates of return on assets5.6 %5.8 %5.3 %
Rates of increase in compensation levels1.7 %2.0 %2.1 %
Estimated Future Contributions and Benefits Payments
(in millions)
Employer contributions:
2022$155 
Benefit Payments:
2022$506 
2023443 
2024444 
2025452 
2026462 
2026 and thereafter2,454 
    Total$4,761 
Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss
The following is a summary of amounts in AOCI, before tax effects:
Fiscal Years Ended
(in millions)March 31, 2021March 31, 2020
Prior service cost$(239)$(247)
Schedule of Fair Value of Financial Assets for Pension and Postretirement Benefits
Fair Value of Plan Assets

The tables below set forth the fair value of plan assets by asset category within the fair value hierarchy:
As of March 31, 2021
(in millions)Level 1Level 2 Level 3Total
Equity:
US Domestic Stocks$— $— $— $— 
Global Stocks— — — — 
Global/International Equity commingled funds246 2,260 — 2,506 
Global equity mutual funds— — — — 
U.S./North American Equity commingled funds— — 
Fixed Income:
Non-U.S. Government funds— — — — 
Fixed income commingled funds42 15 58 
Fixed income mutual funds— — 
Corporate bonds— 5,500 — 5,500 
Alternatives:
Other Alternatives (1)
2,706 1,930 4,637 
Hedge Funds(2)
— 10 11 
Other Assets70 65 85 220 
Insurance contracts380 — 384 
Cash and cash equivalents97 — 99 
Totals
$419 $10,975 $2,031 $13,425 
As of March 31, 2020
(in millions)Level 1Level 2Level 3Total
Equity:
US Domestic Stocks$— $$— $
Global Stocks— — 
Global/International Equity commingled funds315 1,763 — 2,078 
Global equity mutual funds— — 
U.S./North American Equity commingled funds— 
Fixed Income:
Non-U.S. Government funds136 — — 136 
Fixed income commingled funds55 71 — 126 
Fixed income mutual funds— — 
Corporate bonds4,807 — 4,808 
Alternatives:
Other Alternatives (1)
— 2,038 1,297 3,335 
Hedge Funds(2)
11 
Other Assets87 229 59 375 
Insurance contracts— 136 — 136 
Cash and cash equivalents61 — 63 
Totals$669 $9,063 $1,358 $11,090 
        

(1) Represents real estate and other commingled funds consisting mainly of equities, bonds, or commodities.
(2) Represents investments in diversified fund of hedge funds.

Changes in fair value measurements of level 3 investments for the defined benefit plans were as follows:
(in millions)
Balance as of March 31, 2019$1,032 
Actual return on plan assets held at the reporting date83 
Purchases, sales and settlements282 
Transfers in and / or out of Level 3
Changes due to exchange rates(47)
Balance as of March 31, 20201,358 
Actual return on plan assets held at the reporting date233 
Purchases, sales and settlements279 
Transfers in and / or out of Level 3— 
Changes due to exchange rates161 
Balance as of March 31, 2021$2,031 
Plan Asset Allocations
As of
Asset CategoryMarch 31, 2021March 31, 2020
Equity securities19 %19 %
Debt securities42 %46 %
Alternatives37 %31 %
Cash and other%%
Total100 %100 %