Stock Plans (Tables)

12 Months Ended

Dec. 31, 2016

Stock Plans [Abstract]

LTIP Target Performance Shares

	Number of
	Shares
	(in thousands)
Balance at January 1, 2014	1,749
LTIP target performance shares granted	1,037
LTIP target performance shares forfeited	(104)
Balance at December 31, 2014	2,682
LTIP target performance shares granted	738
LTIP target performance shares earned	(743)
LTIP target performance shares forfeited	(152)
Balance at December 31, 2015	2,525
LTIP target performance shares granted	1,669
LTIP target performance shares earned	(887)
LTIP target performance shares forfeited	(448)
Balance at December 31, 2016	2,859

Restricted Shares Outstanding

		Weighted
		Average
	Number of	Grant Date		Aggregate
	Shares	Fair Value		Fair Value
	(in thousands)	(per share)		(in millions)
Balance at January 1, 2014	6,234	$	4.80	$	29
Restricted stock granted	4,314	$	4.91	$	29
Restricted stock vested	(2,372)	$	5.22	$	16
Restricted stock forfeited	(369)	$	4.55
Balance at December 31, 2014	7,807	$	4.75	$	52
Restricted stock granted	2,815	$	7.92	$	13
Restricted stock vested	(3,215)	$	4.89	$	15
Restricted stock forfeited	(359)	$	5.10
Balance at December 31, 2015	7,048	$	5.93	$	33
Restricted stock granted	5,936	$	4.36	$	20
Restricted stock vested	(3,720)	$	5.26	$	13
Restricted stock forfeited	(908)	$	5.11
Balance at December 31, 2016	8,356	$	5.20	$	28