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Stock Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2013
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 2013, 2012 and 2011 are as follows:
 
2013
 
2012
 
2011
Risk-free interest rate
1.03%-1.30%
 
1.26%-1.27%
 
2.28%-2.90%
Expected life (in years)
6.0
 
6.50
 
6.75
Expected volatility
23.6%-24.1%
 
26.2%-26.4%
 
25.4%-25.8%
Expected dividend yield
2.48%-2.54%
 
2.76%-2.80%
 
2.75%-2.86%
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, 2013 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, 2013
32,045,793

 
$
29.10

 
 
 
 
Granted
2,563,951

 
$
36.55

 
 
 
 
Exercised
(9,928,320
)
 
$
28.31

 
 
 
 
Forfeited
(124,911
)
 
$
30.18

 
 
 
 
Expired
(1,988,647
)
 
$
40.46

 
 
 
 
Balance at December 31, 2013
22,567,866

 
$
29.29

 
4.9 years
 
$
428,167

Options vested or expected to vest at December 31, 2013
22,098,993

 
$
29.26

 
4.9 years

$
419,912

Options exercisable at December 31, 2013
15,750,814

 
$
28.02

 
3.6 years
 
$
318,923
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 as of December 31, 2013 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, 2013
8,964,238

$
28.58

 
730,838

$
31.32

Granted
842,433

$
36.70

 
289,200

$
36.54

Vested
(5,310,027
)
$
26.96

 
(76,844
)
$
31.22

Forfeited
(245,835
)
$
31.29

 
(19,412
)
$
32.71

Adjustment due to performance
—

$
—

 
37,381

$
31.24

Non-vested balance at December 31, 2013
4,250,809

$
32.04

 
961,163

$
32.87
Summary of restricted stock awards activity
A summary of the status of the Company's restricted stock awards as of December 31, 2013 and changes during the period then ended is presented below:
 
Shares

 
Weighted Average
Grant Date
Fair Value
Non-vested balance at January 1, 2013
31,700

 
$
47.31

Granted
—

 
$
—

Vested
(24,500
)
 
$
47.66

Forfeited
—

 
$
—

Non-vested balance at December 31, 2013
7,200

 
$
46.14