Share-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock Awards and Units
Granted	292,193
Restricted Stock
Restricted Stock Awards and Units
Outstanding at beginning of year	691,621	435,377	444,362
Granted	185,782	423,644	167,515
Released	(253,801)	(153,200)	(161,976)
Forfeited	(57,155)	(14,200)	(14,524)
Outstanding at end of year	566,447	691,621	435,377
Performance Stock Units
Restricted Stock Awards and Units
Outstanding at beginning of year	10,345,000	0
Granted	0	10,345,000
Released	0	0
Forfeited	(1,272,000)	0
Outstanding at end of year	9,073,000	10,345,000	0
Restricted Stock Units (RSUs)
Restricted Stock Awards and Units
Outstanding at beginning of year	41,964,000	0
Granted	11,618,000	42,071,000
Released	(8,689,000)	(4,000)
Forfeited	(6,147,000)	(103,000)
Outstanding at end of year	38,746,000	41,964,000	0