Employee Benefit Plans (Stock Option) (Details)		12 Months Ended
	Nov. 06, 2017 period	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 29, 2017 $ / shares	May 31, 2017 shares	May 31, 2015 shares	May 19, 2015 shares
Share-Based Compensation Plans
Number of shares available for future issuance (in shares)			22,500,000
ESPP, offering period (in months)	24 months
ESPP, Number of offering period | period	4
ESPP, Purchase period (in months)	6 months
ESPP, Purchase price (in percentage)	85.00%
ESPP, rolling years (in years)	2 years
Common stock - shares issued (in shares)		365,500,000	381,100,000
Common shares outstanding from equity awards through acquisition (in shares)		3,400,000
Share Price (in USD per share) | $ / shares					$ 28.50
Intrinsic value of options exercised in period | $		$ 7,100,000	$ 7,100,000	$ 27,500,000
Total fair value of options vested | $		$ 700,000	$ 3,900,000	7,000,000
Stock Option Activities
Beginning Balance, Number of Shares		2,400,000
Options Exercised, Number of Shares		(500,000)
Options Expired, Number of Shares		(1,000,000)
Ending Balance, Number of Shares		900,000	2,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning Balance, Weighted Average Exercise Price (in USD per share) | $ / shares		$ 29.20
Options Exercised, Weighted Average Exercise Price (in USD per share) | $ / shares		14.83
Options Expired, Weighted Average Exercise Price (in USD per share) | $ / shares		31.87
Ending Balance, Weighted Average Exercise Price (in USD per share) | $ / shares		$ 34.41	$ 29.20
Weighted Average Remaining Contractual Term at Period End		1 year
Aggregate Intrinsic Value at Period End | $		$ 3,000,000
Vested or Expected-to-Vest Options, Number of Shares at Period End		900,000
Vested or Expected-to-Vest Options, Weighted Average Exercise Price at Period End (in USD per share) | $ / shares		$ 34.41
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End		1 year
Vested or Expected-to-Vest Options, Aggregate Intrinsic Value at Period End | $		$ 3,000,000
Exercisable Options, Number of Shares at Period End		900,000
Exercisable Options, Weighted Average Exercise Price at Period End (in USD per share) | $ / shares		$ 35.67
Exercisable Options, Weighted Average Remaining Contractual Term at Period End		8 months 12 days
Exercisable Options, Aggregate Intrinsic Value at Period End | $		$ 2,100,000
Company recognized tax benefits on total stock-based compensation expense | $		29,100,000	$ 53,300,000	49,500,000
Tax benefit realized related to awards vested or exercised during the period | $		$ 64,100,000	$ 58,600,000	$ 67,100,000
Stock Options | Prior to 2006
Share-Based Compensation Plans
Maximum term for options (in years)		10 years
RSUs, RSAs, and PSAs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End		1 year 1 month 6 days
Equity Incentive Plan 2015
Share-Based Compensation Plans
Number of shares authorized (in shares)								38,000,000
Number of shares available for future issuance (in shares)		33,500,000
Stock Option Activities
Options Canceled, Number of Shares		(1,000,000)
Equity Incentive Plan 1996 and 2006
Share-Based Compensation Plans
Maximum additional shares expire unexercised, under 1996 and 2000 plan (in shares)								29,000,000
Number of shares available for future issuance (in shares)			0
Equity Incentive Plan 2015 and 2006 [Member]
Stock Option Activities
Ending Balance, Number of Shares		17,000,000
Equity Incentive Plan 2006 | Stock Options | From 2006
Share-Based Compensation Plans
Maximum term for options (in years)		7 years
Employee Stock Purchase Plan 2008
Share-Based Compensation Plans
Number of shares authorized (in shares)			35,000,000.0			9,000,000
Number of shares available for future issuance (in shares)		11,200,000
Discount on share purchase price for purchases made under ESPP		15.00%
Periodic payroll deduction - percentage of base salary		10.00%
ESPP individual purchase limits (in shares)		6,000
Period for share purchases under ESPP		12 months
ESPP individual purchase limits | $		$ 25,000
Period for ESPP purchases		1 year
Common stock - shares issued (in shares)		23,800,000
Employee Stock Purchase Plan 2008 Additional Authorization
Share-Based Compensation Plans
Number of shares authorized (in shares)							7,000,000.0
Various Acquisitions
Share-Based Compensation Plans
Common shares outstanding from equity awards through acquisition (in shares)		3,900,000