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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | $ 19,074 |  |
Fair value of plan assets at end of year | 19,394 | $ 19,074 |
Amounts recognized in the consolidated balance sheets: |  |  |
Non-current assets | 2,270 | 1,768 |
Non-current liabilities | (1,632) | (2,662) |
Pension Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Service cost | 38 | 36 | $ 31
Interest cost | 341 | 421 | 487
Post-retirement Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Service cost | 1 | 0 |
Interest cost | 2 | 3 | 3
U.S. | Pension Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 6,914 | 6,322 |
Interest cost | 184 | 213 | 241
Employee contributions | 0 | 0 |
Actuarial (gain) loss | (227) | 650 |
Plan amendments | 1 | 0 |
Benefits paid | (278) | (271) |
Benefit obligation at end of year | 6,594 | 6,914 | 6,322
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 5,100 | 4,715 |
Actual return on plan assets | 680 | 591 |
Employer contributions | 35 | 65 |
Employee contributions | 0 | 0 |
Benefits paid | (278) | (271) |
Other | 0 | 0 |
Fair value of plan assets at end of year | 5,537 | 5,100 | 4,715
Net funded status | (1,057) | (1,814) |
Amounts recognized in the consolidated balance sheets: |  |  |
Current liabilities | (31) | (30) |
Non-current liabilities | (1,026) | (1,784) |
Net amount recognized in consolidated balance sheet | (1,057) | (1,814) |
Amounts recognized in other comprehensive loss: |  |  |
Prior service (credit) cost | 1 | 0 |
Net actuarial loss | 1,777 | 2,446 |
Total recognized accumulated other comprehensive (loss) income | 1,778 | 2,446 |
Cumulative employer contributions in excess of (less than) net periodic cost | 721 | 632 |
Net amount recognized in consolidated balance sheet | (1,057) | (1,814) |
Accumulated benefit obligation | 6,594 | 6,914 |
U.S. | Post-retirement Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 31 | 31 |
Interest cost | 1 | 1 | 1
Employee contributions | 4 | 4 |
Actuarial (gain) loss | (1) | 1 |
Plan amendments | 0 | 0 |
Benefits paid | (7) | (6) |
Benefit obligation at end of year | 28 | 31 | 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 | 3 | 3 |
Employee contributions | 4 | 4 |
Benefits paid | (7) | (6) |
Other | 0 | (1) |
Fair value of plan assets at end of year | 2 | 2 | 2
Net funded status | (26) | (29) |
Amounts recognized in the consolidated balance sheets: |  |  |
Current liabilities | (1) | (1) |
Non-current liabilities | (25) | (28) |
Net amount recognized in consolidated balance sheet | (26) | (29) |
Amounts recognized in other comprehensive loss: |  |  |
Prior service (credit) cost | 0 | 0 |
Net actuarial loss | (3) | (3) |
Total recognized accumulated other comprehensive (loss) income | (3) | (3) |
Cumulative employer contributions in excess of (less than) net periodic cost | (29) | (32) |
Net amount recognized in consolidated balance sheet | (26) | (29) |
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 | 12,998 | 11,321 |
Service cost | 38 | 36 | 31
Interest cost | 157 | 208 | 246
Employee contributions | 2 | 2 |
Actuarial (gain) loss | (617) | 1,273 |
Plan amendments | 7 | 11 |
Effect of settlement | (16) | (13) |
Effect of curtailment | (2) | 0 |
Special termination benefits | 0 | 1 |
Benefits paid | (395) | (402) |
Foreign currency changes | (115) | 561 |
Benefit obligation at end of year | 12,057 | 12,998 | 11,321
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 14,028 | 12,313 |
Actual return on plan assets | 306 | 1,415 |
Effect of settlement | (16) | (13) |
Employer contributions | 95 | 78 |
Employee contributions | 2 | 2 |
Benefits paid | (395) | (402) |
Foreign currency changes | (165) | 635 |
Fair value of plan assets at end of year | 13,855 | 14,028 | 12,313
Net funded status | 1,798 | 1,030 |
Amounts recognized in the consolidated balance sheets: |  |  |
Non-current assets | 2,269 | 1,764 |
Current liabilities | (6) | (7) |
Non-current liabilities | (465) | (727) |
Net amount recognized in consolidated balance sheet | 1,798 | 1,030 |
Amounts recognized in other comprehensive loss: |  |  |
Prior service (credit) cost | (18) | (13) |
Net actuarial loss | (2,904) | (3,467) |
Total recognized accumulated other comprehensive (loss) income | (2,922) | (3,480) |
Cumulative employer contributions in excess of (less than) net periodic cost | 4,720 | 4,510 |
Net amount recognized in consolidated balance sheet | 1,798 | 1,030 |
Accumulated benefit obligation | 11,830 | 12,736 |
Non-U.S. | Post-retirement Benefits |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 73 | 61 |
Service cost | 1 | 0 |
Interest cost | 1 | 2 | 2
Employee contributions | 0 | 0 |
Actuarial (gain) loss | (4) | 10 |
Plan amendments | 0 | 0 |
Effect of settlement | 0 | 0 |
Effect of curtailment | 0 | 0 |
Special termination benefits | 0 | 0 |
Benefits paid | (3) | (2) |
Foreign currency changes | 0 | 2 |
Benefit obligation at end of year | 68 | 73 | 61
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Effect of settlement | 0 | 0 |
Employer contributions | 3 | 2 |
Employee contributions | 0 | 0 |
Benefits paid | (3) | (2) |
Foreign currency changes | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Net funded status | (68) | (73) |
Amounts recognized in the consolidated balance sheets: |  |  |
Non-current assets | 0 | 0 |
Current liabilities | (3) | (3) |
Non-current liabilities | (65) | (70) |
Net amount recognized in consolidated balance sheet | (68) | (73) |
Amounts recognized in other comprehensive loss: |  |  |
Prior service (credit) cost | 7 | 9 |
Net actuarial loss | (10) | (16) |
Total recognized accumulated other comprehensive (loss) income | (3) | (7) |
Cumulative employer contributions in excess of (less than) net periodic cost | (65) | (66) |
Net amount recognized in consolidated balance sheet | (68) | (73) |
Accumulated benefit obligation | $ 0 | $ 0 |

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