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Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Schedule of weighted average actuarial assumptions utilized defined benefit plans
The weighted average actuarial assumptions utilized for the U.S. and significant non-U.S. defined benefit plans and post-retirement benefit plans are as follows:
  
Pension 
Benefits		Post-retirement
Benefits
 2022202120222021
Weighted average assumptions:
Discount rate (for expense)2.28 %1.92 %2.36 %2.42 %
Expected return on plan assets4.57 %4.73 %— — 
Rate of compensation increase (for expense)*3.34 %1.85 %— — 
Discount rate (for benefit obligation)5.16 %2.28 %4.92 %2.36 %
Rate of compensation increase (for benefit obligation)*3.16 %2.16 %— — 
The weighted average actuarial assumptions utilized in determining expense during the year and benefit obligation at the end of the year for the U.S. defined benefit and other U.S. post-retirement plans are as follows:
U.S. Pension
Benefits		U.S. Post-retirement Benefits
2022202120222021
Weighted average assumptions:
Discount rate (for expense)3.00 %2.73 %2.56 %2.18 %
Expected return on plan assets6.88 %7.03 %— — 
Discount rate (for benefit obligation)5.53 %3.00 %5.31 %2.56 %
Non-U.S. Pension
Benefits		Non-U.S.
Post-retirement Benefits
2022202120222021
Weighted average assumptions:
Discount rate (for expense)1.89 %1.49 %2.28 %1.96 %
Expected return on plan assets3.64 %3.89 %— — 
Rate of compensation increase (for expense)3.34 %2.84 %— — 
Discount rate (for benefit obligation)4.89 %1.89 %4.73 %2.28 %
Rate of compensation increase (for benefit obligation)3.16 %3.34 %— — 
Schedule of components of net periodic benefit cost for U.S. defined benefit and other postretirement benefit plans The components of the net benefit (credit) or cost for the years 2022, 2021 and 2020 are as follows:
Combined U.S. and significant non-U.S. PlansPensionPost-retirement
For the Years Ended December 31,BenefitsBenefits
(In millions)202220212020202220212020
Service cost$28 $38 $36 $— $1 $— 
Interest cost389 341 421 3 2 3 
Expected return on plan assets(778)(832)(844)— — — 
Amortization of prior service1 — — (2)(2)(2)
Recognized actuarial loss (gain)149 206 161 1 1 — 
Net periodic benefit (credit) cost(211)(247)(226)2 2 1 
Curtailment loss— 2 — — — — 
Plan termination — — 1 — — — 
Settlement loss2 5 3 — — — 
Net benefit (credit) cost$(209)$(240)$(222)$2 $2 $1 
The following table provides the amounts reported in the consolidated statements of income:
Combined U.S. and significant non-U.S. PlansPension
Benefits		Post-retirement
Benefits
For the Years Ended December 31,
(In millions)202220212020202220212020
Compensation and benefits expense $28 $38 $36 $— $1 $— 
Other net benefit (credit) cost(237)(278)(258)2 1 1 
Net benefit (credit) cost$(209)$(240)$(222)$2 $2 $1 
The components of the net benefit (credit) cost for the U.S. defined benefit and other post-retirement benefit plans are as follows:
U.S. Plans onlyPension
Benefits		Post-retirement
Benefits
For the Years Ended December 31,
(In millions)202220212020202220212020
Interest cost$193 $184 $213 $1 $1 $1 
Expected return on plan assets(336)(327)(345)— — — 
Recognized actuarial loss (gain)74 90 72 — (1)— 
Net benefit (credit) cost$(69)$(53)$(60)$1 $— $1 
The components of the net benefit (credit) or cost for the non-U.S. defined benefit and other post-retirement benefit plans and the curtailment, settlement and termination expenses are as follows:
For the Years Ended December 31,Non-U.S. Pension
Benefits		Non-U.S. Post-retirement
Benefits
(In millions)202220212020202220212020
Service cost$28 $38 $36 $— $1 $— 
Interest cost196 157 208 2 1 2 
Expected return on plan assets(442)(505)(499)— — — 
Amortization of prior service credit1 — — (2)(2)(2)
Recognized actuarial loss75 116 89 1 2 — 
Net periodic benefit (credit) cost(142)(194)(166)1 2 — 
Settlement loss2 5 3 — — — 
Curtailment loss— 2 — — — — 
Special termination benefits— — 1 — — — 
Net benefit (credit) cost$(140)$(187)$(162)$1 $2 $— 
Schedule of MMC's defined benefit plans and postretirement plans
The following tables provide information concerning the Company’s U.S. defined benefit pension and post-retirement benefit plans:
U.S. Pension
Benefits		U.S. Post-retirement
Benefits
(In millions)2022202120222021
Change in benefit obligation:
Benefit obligation at beginning of year$6,594 $6,914 $28 $31 
Interest cost193 184 1 1 
Employee contributions— — 3 4 
Plan amendments— 1 — — 
Actuarial gain(1,625)(227)(3)(1)
Benefits paid(286)(278)(7)(7)
Benefit obligation, December 31$4,876 $6,594 $22 $28 
Change in plan assets:
Fair value of plan assets at beginning of year$5,537 $5,100 $2 $2 
Actual return on plan assets(1,005)680 — — 
Employer contributions30 35 4 3 
Employee contributions— — 3 4 
Benefits paid(286)(278)(7)(7)
Fair value of plan assets, December 31$4,276 $5,537 $2 $2 
Net funded status, December 31$(600)$(1,057)$(20)$(26)
Amounts recognized in the consolidated balance sheets:
Current liabilities$(31)$(31)$(1)$(1)
Non-current liabilities(569)(1,026)(19)(25)
Net liability recognized, December 31$(600)$(1,057)$(20)$(26)
Amounts recognized in other comprehensive income (loss):
Prior service cost$(1)$(1)$— $— 
Net actuarial (loss) gain(1,419)(1,777)8 3 
Total recognized accumulated other comprehensive (loss) income, December 31$(1,420)$(1,778)$8 $3 
Cumulative employer contributions in excess of (less than) net benefit (credit) cost820 721 (28)(29)
Net amount recognized in consolidated balance sheet$(600)$(1,057)$(20)$(26)
Accumulated benefit obligation at December 31$4,876 $6,594 $— $— 
The following tables provide information concerning the Company’s non-U.S. defined benefit pension and post-retirement benefit plans:
Non-U.S. Pension
Benefits		Non-U.S.
Post-retirement Benefits
(In millions)2022202120222021
Change in benefit obligation:
Benefit obligation at beginning of year$12,057 $12,998 $68 $73 
Service cost28 38 — 1 
Interest cost196 157 2 1 
Employee contributions3 2 — — 
Plan combination2 — — — 
Actuarial (gain) loss (3,953)(617)(14)(4)
Plan amendments— 7 — — 
Effect of settlement(22)(16)— — 
Effect of curtailment— (2)— — 
Benefits paid(342)(395)(2)(3)
Foreign currency changes(1,083)(115)(6)— 
Benefit obligation, December 31$6,886 $12,057 $48 $68 
Change in plan assets:
Fair value of plan assets at beginning of year$13,855 $14,028 $— $— 
Plan combination1 — — — 
Actual return on plan assets(3,609)306 — — 
Effect of settlement(22)(16)— — 
Company contributions139 95 2 3 
Employee contributions3 2 — — 
Benefits paid(342)(395)(2)(3)
Foreign currency changes(1,261)(165)— — 
Fair value of plan assets, December 31$8,764 $13,855 $— $— 
Net funded status, December 31$1,878 $1,798 $(48)$(68)
Amounts recognized in the consolidated balance sheets:
Non-current assets$2,127 $2,269 $— $— 
Current liabilities(6)(6)(3)(3)
Non-current liabilities(243)(465)(45)(65)
Net asset (liability) recognized, December 31$1,878 $1,798 $(48)$(68)
Amounts recognized in other comprehensive loss:
Prior service (credit) cost$(16)$(18)$5 $7 
Net actuarial loss(2,610)(2,904)6 (10)
Total recognized accumulated other comprehensive (loss) income, December 31$(2,626)$(2,922)$11 $(3)
Cumulative employer contributions in excess of (less than) net benefit (credit) cost4,504 4,720 (59)(65)
Net asset (liability) recognized in consolidated balance sheets, December 31$1,878 $1,798 $(48)$(68)
Accumulated benefit obligation, December 31$6,776 $11,830 $— $— 
Schedule of total recognized in net periodic benefit cost and other comprehensive income (loss)
U.S. Pension
Benefits		U.S. Post-retirement
Benefits
(In millions)2022202120222021
Reconciliation of net actuarial (loss) gain recognized in accumulated other comprehensive income (loss):
Beginning balance$(1,777)$(2,446)$3 $3 
Recognized as component of net benefit (credit) cost74 90 — (1)
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Other— (1)2 — 
Liability experience1,625 227 3 1 
Asset experience(1,341)353 — — 
Total gain recognized as change in plan assets and benefit obligations284 579 5 1 
Net actuarial (loss) gain, December 31$(1,419)$(1,777)$8 $3 
Non-U.S. Pension
Benefits		Non-U.S.
Post-retirement Benefits
(In millions)2022202120222021
Reconciliation of prior service (cost) credit recognized in accumulated other comprehensive income (loss):
Beginning balance$(18)$(13)$7 $9 
Recognized as component of net benefit (credit) cost:
Amortization of prior service credit— — (2)(2)
Effect of curtailment— 2 — — 
Total recognized as component of net benefit (credit) cost— 2 (2)(2)
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Plan amendments— (7)— — 
Exchange rate adjustments2 — — — 
Prior service (cost) credit, December 31$(16)$(18)$5 $7 
Non-U.S. Pension
Benefits		Non-U.S.
Post-retirement Benefits
(In millions)2022202120222021
Reconciliation of net actuarial (loss) gain recognized in accumulated other comprehensive (loss) income:
Beginning balance$(2,904)$(3,467)$(10)$(16)
Recognized as component of net benefit (credit) cost:
Amortization of net loss75 116 1 2 
Effect of settlement2 5 — — 
Total recognized as component of net benefit (credit) cost77 121 1 2 
Changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Liability experience3,953 617 14 4 
Asset experience(4,051)(199)— — 
Effect of curtailment— 2 — — 
Total amount recognized as change in plan assets and benefit obligations(98)420 14 4 
Exchange rate adjustments315 22 1 — 
Net actuarial (loss) gain, December 31$(2,610)$(2,904)$6 $(10)
Schedule of amounts recognized in other comprehensive income (loss)
For the Years Ended December 31,U.S. Pension
Benefits		U.S. Post-retirement
Benefits
(In millions)202220212020202220212020
Total recognized in net benefit (credit) cost and other comprehensive (income) loss $(427)$(722)$272 $(4)$— $2 
For the Years Ended December 31,Non-U.S. Pension
Benefits		Non-U.S. Post-retirement
Benefits
(In millions)202220212020202220212020
Total recognized in net benefit (credit) cost and other comprehensive (income) loss$(436)$(745)$261 $(13)$(2)$13 
Schedule of estimated future benefit payments for its pension and postretirement benefits
The estimated future benefit payments for the Company's pension and post-retirement benefit plans are as follows:
For the Years Ended December 31,Pension
Benefits		Post-retirement
Benefits
(In millions)U.S.Non-U.S.U.S.Non-U.S.
2023$312 $337 $3 $3 
2024$324 $344 $3 $3 
2025$337 $352 $3 $3 
2026$343 $360 $2 $3 
2027$347 $371 $2 $3 
2028-2032$1,760 $2,054 $8 $15 
Summary of the U.S. and non-U.S. plans investments measured at fair value on a recurring basis
The following table sets forth, by level within the fair value hierarchy, a summary of the U.S. and non-U.S. plans' investments measured at fair value on a recurring basis at December 31, 2022 and 2021:
Fair Value Measurements at December 31, 2022
Assets
(In millions)
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		NAVTotal
Common/collective trusts$43 $— $— $3,995 $4,038 
Corporate obligations— 2,402 — — 2,402 
Corporate stocks527 36 1 — 564 
Private equity/partnerships— — — 1,433 1,433 
Government securities15 4,662 — — 4,677 
Real estate— — — 261 261 
Short-term investment funds609 3 — — 612 
Company common stock331 — — — 331 
Other investments10 11 308 — 329 
Total investments$1,535 $7,114 $309 $5,689 $14,647 
Net derivative liabilities— (1,605)— — (1,605)
Net investments$1,535 $5,509 $309 $5,689 $13,042 
  
Fair Value Measurements at December 31, 2021
Assets
(In millions)
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		NAVTotal
Common/collective trusts$476 $— $— $5,221 $5,697 
Corporate obligations— 4,209 — — 4,209 
Corporate stocks2,368 44 1 — 2,413 
Private equity/partnerships— — — 1,531 1,531 
Government securities15 7,364 — — 7,379 
Real estate— — — 356 356 
Short-term investment funds681 — — — 681 
Company common stock348 — — — 348 
Other investments11 6 662 — 679 
Total investments$3,899 $11,623 $663 $7,108 $23,293 
Net derivative liabilities— (3,899)— — (3,899)
Net investments$3,899 $7,724 $663 $7,108 $19,394 
Summary of changes in the fair value of the plans' Level 3 assets
The tables below set forth a summary of changes in the fair value of the plans’ Level 3 assets for the years ended December 31, 2022 and December 31, 2021:
Assets
(In millions)
Fair Value,
January 1, 2022		PurchasesSalesUnrealized
Gain/
(Loss)		Realized
Gain/
(Loss)		Exchange
Rate
Impact		Transfers
in/(out)
and
Other		Fair
Value, December 31, 2022
Other investments$662 $18 $(19)$(302)$— $(51)$— $308 
Corporate stocks1 — — — — — — 1 
Total assets$663 $18 $(19)$(302)$— $(51)$— $309 
Assets
(In millions)
Fair Value,
January 1, 2021		PurchasesSalesUnrealized
Gain/
(Loss)		Realized
Gain/
(Loss)		Exchange
Rate
Impact		Transfers
in/(out)
and
Other 		Fair
Value, December 31, 2021
Other investments$773 $19 $(15)$(78)$1 $(36)$(2)$662 
Corporate stocks1 1 — (1)— — — 1 
Total assets$774 $20 $(15)$(79)$1 $(36)$(2)$663