Stock Plans (Restricted Shares Outstanding) (Details) (Restricted Stock [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)	7,807,000
Shares granted (in shares)	2,763,000	3,741,000
Shares earned (in shares)	(3,163,000)
Shares forfeited (in shares)	(199,000)
Balance at end of period (in shares)	7,208,000
Balance at beginning of period (in dollars per shares)	$ 4.75
Restricted stock granted (in dollars per shares)	$ 7.98
Restricted stock vested (in dollars per shares)	$ 4.90
Restricted stock forfeited (in dollars per shares)	$ 4.49
Balance at end of period (in dollars per shares)	$ 5.92	$ 4.71
Balance at beginning of period	$ 52
Restricted stock granted	19	21
Restricted stock vested	22	13
Balance at end of period	$ 51	$ 44