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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Movements Of Share Awards
Movements on share awards during the periods ended June 30, are detailed below:
 
For the six months ended June 30, 2016
 
For the six months ended June 30, 2015
Millions of shares, except fair values
Time- Vested
 
Performance- Vested
 
Weighted Average Grant Date Fair Value ($)
 
Time- Vested
 
Performance- Vested
Unvested at the beginning of period
10.4

 
0.6

 
33.62

 
11.5

 
0.5

Granted during the period
6.3

 
0.4

 
27.39

 
3.9

 
0.3

Forfeited during the period
(0.1
)
 
—

 
31.81

 
(0.1
)
 
—

Vested and distributed during the period
(4.1
)
 
(0.2
)
 
31.35

 
(4.4
)
 
(0.2
)
Unvested at the end of the period
12.5

 
0.8

 
31.21

 
10.9

 
0.6