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Retirement Benefits (Schedules Providing Information Concerning MMC's Defined Benefit Pension Plans and Postretirement Benefit Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | $ 19,394 |  |
Fair value of plan assets at end of year | 13,042 | $ 19,394 |
Amounts recognized in the consolidated balance sheets: |  |  |
Non-current assets | 2,127 | 2,270 |
Non-current liabilities | (921) | (1,632) |
Pension Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Service cost | 28 | 38 | $ 36
Interest cost | 389 | 341 | 421
Post-retirement Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Service cost | 0 | 1 |
Interest cost | 3 | 2 | 3
U.S. | Pension Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 6,594 | 6,914 |
Interest cost | 193 | 184 | 213
Employee contributions | 0 | 0 |
Actuarial gain | (1,625) | (227) |
Plan amendments | 0 | 1 |
Benefits paid | (286) | (278) |
Benefit obligation at end of year | 4,876 | 6,594 | 6,914
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 5,537 | 5,100 |
Actual return on plan assets | (1,005) | 680 |
Employer contributions | 30 | 35 |
Employee contributions | 0 | 0 |
Benefits paid | (286) | (278) |
Fair value of plan assets at end of year | 4,276 | 5,537 | 5,100
Net funded status | (600) | (1,057) |
Amounts recognized in the consolidated balance sheets: |  |  |
Current liabilities | (31) | (31) |
Non-current liabilities | (569) | (1,026) |
Net amount recognized in consolidated balance sheet | (600) | (1,057) |
Amounts recognized in other comprehensive loss: |  |  |
Prior service cost | (1) | (1) |
Net actuarial loss | 1,419 | 1,777 |
Total recognized accumulated other comprehensive (loss) income, December 31 | (1,420) | (1,778) |
Cumulative employer contributions in excess of (less than) net benefit (credit) cost | 820 | 721 |
Net amount recognized in consolidated balance sheet | (600) | (1,057) |
Accumulated benefit obligation | 4,876 | 6,594 |
U.S. | Post-retirement Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 28 | 31 |
Interest cost | 1 | 1 | 1
Employee contributions | 3 | 4 |
Actuarial gain | (3) | (1) |
Plan amendments | 0 | 0 |
Benefits paid | (7) | (7) |
Benefit obligation at end of year | 22 | 28 | 31
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 2 | 2 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 4 | 3 |
Employee contributions | 3 | 4 |
Benefits paid | (7) | (7) |
Fair value of plan assets at end of year | 2 | 2 | 2
Net funded status | (20) | (26) |
Amounts recognized in the consolidated balance sheets: |  |  |
Current liabilities | (1) | (1) |
Non-current liabilities | (19) | (25) |
Net amount recognized in consolidated balance sheet | (20) | (26) |
Amounts recognized in other comprehensive loss: |  |  |
Prior service cost | 0 | 0 |
Net actuarial loss | (8) | (3) |
Total recognized accumulated other comprehensive (loss) income, December 31 | 8 | 3 |
Cumulative employer contributions in excess of (less than) net benefit (credit) cost | (28) | (29) |
Net amount recognized in consolidated balance sheet | (20) | (26) |
Accumulated benefit obligation | 0 | 0 |
Non-U.S. | Pension Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 12,057 | 12,998 |
Service cost | 28 | 38 | 36
Interest cost | 196 | 157 | 208
Employee contributions | 3 | 2 |
Plan combination | 2 | 0 |
Actuarial gain | (3,953) | (617) |
Plan amendments | 0 | 7 |
Effect of settlement | (22) | (16) |
Effect of curtailment | 0 | (2) |
Benefits paid | (342) | (395) |
Foreign currency changes | (1,083) | (115) |
Benefit obligation at end of year | 6,886 | 12,057 | 12,998
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 13,855 | 14,028 |
Plan combination | 1 | 0 |
Actual return on plan assets | (3,609) | 306 |
Effect of settlement | (22) | (16) |
Employer contributions | 139 | 95 |
Employee contributions | 3 | 2 |
Benefits paid | (342) | (395) |
Foreign currency changes | (1,261) | (165) |
Fair value of plan assets at end of year | 8,764 | 13,855 | 14,028
Net funded status | 1,878 | 1,798 |
Amounts recognized in the consolidated balance sheets: |  |  |
Non-current assets | 2,127 | 2,269 |
Current liabilities | (6) | (6) |
Non-current liabilities | (243) | (465) |
Net amount recognized in consolidated balance sheet | 1,878 | 1,798 |
Amounts recognized in other comprehensive loss: |  |  |
Prior service cost | 16 | 18 |
Net actuarial loss | (2,610) | (2,904) |
Total recognized accumulated other comprehensive (loss) income, December 31 | 2,626 | 2,922 |
Cumulative employer contributions in excess of (less than) net benefit (credit) cost | 4,504 | 4,720 |
Net amount recognized in consolidated balance sheet | 1,878 | 1,798 |
Accumulated benefit obligation | 6,776 | 11,830 |
Non-U.S. | Post-retirement Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 68 | 73 |
Service cost | 0 | 1 |
Interest cost | 2 | 1 | 2
Employee contributions | 0 | 0 |
Plan combination | 0 | 0 |
Actuarial gain | (14) | (4) |
Plan amendments | 0 | 0 |
Effect of settlement | 0 | 0 |
Effect of curtailment | 0 | 0 |
Benefits paid | (2) | (3) |
Foreign currency changes | (6) | 0 |
Benefit obligation at end of year | 48 | 68 | 73
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Plan combination | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Effect of settlement | 0 | 0 |
Employer contributions | 2 | 3 |
Employee contributions | 0 | 0 |
Benefits paid | (2) | (3) |
Foreign currency changes | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Net funded status | (48) | (68) |
Amounts recognized in the consolidated balance sheets: |  |  |
Non-current assets | 0 | 0 |
Current liabilities | (3) | (3) |
Non-current liabilities | (45) | (65) |
Net amount recognized in consolidated balance sheet | (48) | (68) |
Amounts recognized in other comprehensive loss: |  |  |
Prior service cost | (5) | (7) |
Net actuarial loss | 6 | (10) |
Total recognized accumulated other comprehensive (loss) income, December 31 | (11) | 3 |
Cumulative employer contributions in excess of (less than) net benefit (credit) cost | (59) | (65) |
Net amount recognized in consolidated balance sheet | (48) | (68) |
Accumulated benefit obligation | $ 0 | $ 0 |

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