Retirement Benefits (Schedules Providing Information Concerning MMC's Defined Benefit Pension Plans and Postretirement Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	$ 14,879	$ 13,562
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	967	979
Noncurrent liabilities	(2,244)	(1,150)
U.S. Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	4,827	5,197
Service cost	91	104	93
Interest cost	253	229	230
Plan amendments	0	0
Defined Benefit Plan, Plan Combination	0	36
Actuarial (gain) loss	955	(547)
Medicare Part D subsidy	0	0
Benefits paid	(202)	(192)
Benefit obligation at end of year	5,924	4,827	5,197
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	4,279	3,936
Plan Combination	0	21
Actual return on plan assets	414	488
Employer/Company contributions	25	26
Medicare Part D subsidy	0	0
Employee contributions	0	0
Benefits paid	(202)	(192)
Other	0	0
Fair value of plan assets at end of year	4,516	4,279	3,936
Funded status	(1,408)	(548)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(25)	(24)
Noncurrent liabilities	(1,383)	(524)
Net asset (liability) recognized in consolidated balance sheet, December 31	(1,408)	(548)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Prior service credit	0	7
Net actuarial (loss) gain	(1,749)	(974)
Total recognized accumulated other comprehensive (loss) income, December 31	(1,749)	(967)
Cumulative employer contributions in excess (deficient) of net periodic cost	341	419
Net asset (liability) recognized in consolidated balance sheet, December 31	(1,408)	(548)
Accumulated benefit obligation at December 31	5,825	4,753
U.S. Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	158	176
Service cost	2	3	3
Interest cost	7	7	8
Plan amendments	(4)	0
Defined Benefit Plan, Plan Combination	0	0
Actuarial (gain) loss	21	(15)
Medicare Part D subsidy	1	1
Benefits paid	(21)	(14)
Benefit obligation at end of year	177	158	176
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
Employer/Company contributions	13	13
Medicare Part D subsidy	1	1
Employee contributions	13	0
Benefits paid	(21)	(14)
Other	12	0
Fair value of plan assets at end of year	18	0	0
Funded status	(159)	(158)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(2)	(8)
Noncurrent liabilities	(157)	(150)
Net asset (liability) recognized in consolidated balance sheet, December 31	(159)	(158)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Prior service credit	4	0
Net actuarial (loss) gain	2	13
Total recognized accumulated other comprehensive (loss) income, December 31	6	13
Cumulative employer contributions in excess (deficient) of net periodic cost	(165)	(171)
Net asset (liability) recognized in consolidated balance sheet, December 31	(159)	(158)
Accumulated benefit obligation at December 31	0	0
Non- U.S Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	8,711	8,579
Service cost	122	148	147
Interest cost	388	352	366
Plan amendments	(13)	0
Actuarial (gain) loss	1,619	(53)
Effect of settlement	(11)	(2)
Benefits paid	(311)	(293)
Foreign currency charges	(585)	(31)
Other	62	0
Benefit obligation at end of year	10,018	8,711	8,579
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	9,351	8,312
Actual return on plan assets	1,756	698
Effect of settlement	(11)	(2)
Employer/Company contributions	156	620
Employee contributions	10	11
Benefits paid	(311)	(293)
Foreign currency changes	(578)	5
Other	37	0
Fair value of plan assets at end of year	10,410	9,351	8,312
Funded status	392	640
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	967	977
Current liabilities	(6)	(5)
Noncurrent liabilities	(569)	(332)
Net asset (liability) recognized in consolidated balance sheet, December 31	392	640
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Prior service credit	(2)	85
Net actuarial (loss) gain	(3,215)	(3,010)
Total recognized accumulated other comprehensive (loss) income, December 31	(3,217)	(2,925)
Cumulative employer contributions in excess (deficient) of net periodic cost	3,609	3,565
Net asset (liability) recognized in consolidated balance sheet, December 31	392	640
Accumulated benefit obligation at December 31	9,731	8,413
Foreign Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	97	107
Service cost	2	2	2
Interest cost	4	4	5
Plan amendments	0	0
Actuarial (gain) loss	(1)	(8)
Effect of settlement	0	0
Benefits paid	(3)	(4)
Foreign currency charges	(6)	(4)
Other	0	0
Benefit obligation at end of year	93	97	107
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/Company contributions	3	4
Employee contributions	0	0
Benefits paid	(3)	(4)
Foreign currency changes	0	0
Other	0	0
Fair value of plan assets at end of year	0	0	0
Funded status	(93)	(97)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	0	0
Current liabilities	(4)	(4)
Noncurrent liabilities	(89)	(93)
Net asset (liability) recognized in consolidated balance sheet, December 31	(93)	(97)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Prior service credit	0	0
Net actuarial (loss) gain	(14)	(16)
Total recognized accumulated other comprehensive (loss) income, December 31	(14)	(16)
Cumulative employer contributions in excess (deficient) of net periodic cost	(79)	(81)
Net asset (liability) recognized in consolidated balance sheet, December 31	(93)	(97)
Accumulated benefit obligation at December 31	$ 0	$ 0

Defined Benefit Plan, Benefit Obligation, Plan Combination

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Defined Benefit Plan, Change In Fair Value of Plan Assets, Gross Prescription Drug Subsidy Receipts Received

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Defined Benefit Plan, Cumulative Employer Contributions In Excess Of Net Periodic Cos

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Defined Benefit Plan, Fair Value Of Plan Assets, Other Changes

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Defined Benefit Plan, Plan Amendment, Plan Asset

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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-Glossary Prior Service Cost

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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-Glossary Gain or Loss

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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- Definition

The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Glossary Projected Benefit Obligation

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-Glossary Accumulated Postretirement Benefit Obligation

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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-Glossary Postretirement Benefits

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 60

-Glossary Plan Amendment

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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