Employee Benefit Plans, Share Based Compensation, Equity Instruments Other Than Options (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Sep. 22, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Weighted Average Grant-Date Fair Value per Share
Common stock, dividends paid per share (in dollar per share)	$ 0.1
Common stock dividends paid	$ 38.5			$ 118.0
Employee stock purchase plan 2008 [Member]
Employee Stock Purchase Plan
Employee stock purchase plans offering period duration				6 months
Stock issued during period, shares, employee stock purchase plans		1,300,000	1,400,000	2,700,000	2,900,000
Average price of common stock, per share (in dollars per share)		$ 19.18	$ 20.01	$ 19.25	$ 19.30
RSUs, RSAs, and PSAs [Member]
Number of Shares
Balance as of December 31, 2014 (in shares)				21,300,000
Balance as of September 30, 2015 (in shares)		19,600,000		19,600,000
Weighted Average Grant-Date Fair Value per Share
Balance as of December 31, 2014 (in dollars per share)				$ 22.05
Balance as of September 30, 2015 (in dollars per share)		$ 22.15		$ 22.15
Weighted Average Remaining Contractual Term (In Years)				1 year 2 months 12 days
Aggregate Intrinsic Value		$ 504.4		$ 504.4
Restricted stock units (RSUs)
Number of Shares
Granted (in shares)				8,100,000
Vested (in shares)				(6,000,000)
Canceled (in shares)				(1,900,000)
Weighted Average Grant-Date Fair Value per Share
Granted (in dollars per share)				$ 22.90
Vested (in dollars per share)				23.19
Canceled (in dollars per share)				$ 22.09
Performance shares (PSAs)
Number of Shares
Granted (in shares)				800,000
Vested (in shares)				(300,000)
Canceled (in shares)				(1,000,000)
Weighted Average Grant-Date Fair Value per Share
Granted (in dollars per share)				$ 22.44
Vested (in dollars per share)				22.52
Canceled (in dollars per share)				$ 22.28
Aggregate number of shares subject to PSAs granted				500,000
Minimum shares to be issued on achievement of performance goals in respect of PSAs				0
Maximum shares to be issued on achievement of performance goals in respect of PSAs				800,000
Restricted stock awards (RSAs)
Number of Shares
Vested (in shares)				(1,400,000)
Weighted Average Grant-Date Fair Value per Share
Vested (in dollars per share)				$ 20.28