Stock-Based Compensation Plans (Restricted Stock Units) (Details) (Restricted Stock Units (RSUs) [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Stock Units (RSUs) [Member]
Changes to non-vested restricted stock and restricted stock units
Non-vested, beginning balance, shares	3.9	4.2
Non-vested, beginning balance, weighted average fair value at date of grant	$ 11.08	$ 10.64
Granted, shares	1.6	1.5	2.3
Granted, weighted average fair value at date of grant	$ 13.11	$ 13.67	$ 11.45
Vested, shares	(2.2)	(0.6)
Vested, weighted average fair value at date of grant	$ 10.17	$ 11.70
Forfeited, shares	(0.8)	(1.2)
Forfeited, weighted average fair value at date of grant	$ 11.96	$ 11.22
Non-vested, ending balance, shares	2.5	3.9	4.2
Non-vested, ending balance, weighted average fair value at date of grant	$ 12.91	$ 11.08	$ 10.64