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Stock Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Option pricing valuation model for options granted
The assumptions used in the Black-Scholes option pricing valuation model for options granted by the Company in 2014, 2013 and 2012 are as follows:
 
2014
 
2013
 
2012
Risk-free interest rate
1.88%
 
1.03%-1.30%
 
1.26%-1.27%
Expected life (in years)
6.0
 
6.0
 
6.50
Expected volatility
24.2%
 
23.6%-24.1%
 
26.2%-26.4%
Expected dividend yield
2.08%
 
2.48%-2.54%
 
2.76%-2.80%
Summary of the status of MMC's stock option awards
A summary of the status of the Company’s stock option awards as of December 31, 2014 and changes during the year then ended is presented below:
 
Shares

 
Weighted
Average Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic Value
($000)
Balance at January 1, 2014
22,567,866

 
$
29.29

 
 
 
 
Granted
1,716,637

 
$
48.00

 
 
 
 
Exercised
(6,060,823
)
 
$
29.39

 
 
 
 
Forfeited
(149,501
)
 
$
35.76

 
 
 
 
Expired
(79,097
)
 
$
32.98

 
 
 
 
Balance at December 31, 2014
17,995,082

 
$
30.97

 
5.1 years
 
$
488,937

Options vested or expected to vest at December 31, 2014
17,709,073

 
$
30.90

 
5.1 years

$
482,479

Options exercisable at December 31, 2014
12,440,781

 
$
27.74

 
3.9 years
 
$
378,296
Summary of restricted stock units and performance stock units
A summary of the status of the Company's restricted stock units and performance stock units ("PSU's") as of December 31, 2014 and changes during the period then ended is presented below:
 
Restricted Stock Units
 
Performance Stock Units
 
Shares

Weighted Average
Grant Date
Fair Value

 
Shares

Weighted Average Grant Date Fair Value

Non-vested balance at January 1, 2014
4,250,809

$
32.04

 
961,163

$
32.87

Granted
753,213

$
48.16

 
231,445

$
48.00

Vested
(2,779,606
)
$
31.23

 
(613,734
)
$
30.73

Forfeited
(126,686
)
$
34.85

 
(17,446
)
$
37.45

Adjustment due to performance
—

$
—

 
306,580

$
30.72

Non-vested balance at December 31, 2014
2,097,730

$
38.74

 
868,008

$
37.56
Summary of restricted stock awards activity
A summary of the status of the Company's restricted stock awards as of December 31, 2014 and changes during the period then ended is presented below:
 
Shares

 
Weighted Average
Grant Date
Fair Value
Non-vested balance at January 1, 2014
7,200

 
$
46.14

Granted
—

 
$
—

Vested
—

 
$
—

Forfeited
—

 
$
—

Non-vested balance at December 31, 2014
7,200

 
$
46.14