Employee Benefit Plans (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Share-Based Compensation Plans
Common Stock, Shares, Issued	505,600,000	505,600,000	508,400,000
Outstanding Stock Options, Restricted Stock Units, and Restricted Stock Awards from Awards Assumed	6,200,000	6,200,000
Stock Option Activities
Beginning Balance, Number of Shares		34,100,000
Options Granted, Number of Shares		0
Options Canceled, Number of Shares		(600,000)
Options Exercised, Number of Shares		(2,900,000)
Options Expired, Number of Shares		(2,400,000)
Ending Balance, Number of Shares	28,200,000	28,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning Balance, Weighted Average Exercise Price		$ 24.13
Options Granted, Weighted Average Exercise Price		$ 0.00
Options Canceled, Weighted Average Exercise Price		$ 31.49
Options Exercised, Weighted Average Exercise Price		$ 15.72
Options Expired, Weighted Average Exercise Price		$ 28.45
Ending Balance, Weighted Average Exercise Price	$ 24.47	$ 24.47
Weighted Average Remaining Contractual Term at Period End		2 years 10 months 24 days
Aggregate Intrinsic Value at Period End	$ 38,400,000	$ 38,400,000
Vested or Expected-to-Vest Options, Number of Shares at Period End	27,600,000	27,600,000
Vested or Expected-to-Vest Options, Weighted Average Exercise Price at Period End	$ 24.53	$ 24.53
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End		2 years 9 months 18 days
Vested or Expected-to-Vest Options, Aggregate Intrinsic Value at Period End	35,400,000	35,400,000
Exercisable Options, Number of Shares at Period End	23,700,000	23,700,000
Exercisable Options, Weighted Average Exercise Price at Period End	$ 24.50	$ 24.50
Exercisable Options, Weighted Average Remaining Contractual Term at Period End		2 years 3 months 18 days
Exercisable Options, Aggregate Intrinsic Value at Period End	21,900,000	21,900,000
Share Price	$ 19.31	$ 19.31
Pre-tax intrinsic value of options exercised	2,600,000	14,500,000
Equity Incentive Plan 2006 [Member]
Share-Based Compensation Plans
Number of Shares in Authorized	149,500,000	149,500,000
Number of Shares Outstanding	49,600,000	49,600,000
Number of Shares Available for Future Issuance	46,400,000	46,400,000
Plan 1996 and 2000 [Member]
Share-Based Compensation Plans
Maximum Additional Shares Expire Unexercised, Under 1996 and 2000 Plan	75,000,000	75,000,000
Employee Stock Purchase Plan 2008 [Member]
Share-Based Compensation Plans
Common Stock, Capital Shares Reserved for Future Issuance	19,000,000	19,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price		15.00%
Periodic Payroll Deduction - Percentage of Base Salary	10.00%	10.00%
Maximum Purchase of Common Stock, Shares		6,000
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period		12 months
Maximum Purchase of Common Stock, Value		$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		1 year
Common Stock, Shares, Issued	11,400,000	11,400,000
Employee Stock Purchase Plan [Member] | Employee Stock Purchase Plan 2008 [Member]
Share-Based Compensation Plans
Number of Shares Available for Future Issuance	7,600,000	7,600,000