Employee Benefit Plans (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee retirement and savings plan cost	$ 126,000,000	$ 113,000,000	$ 109,000,000
Closing stock price as of December 30, 2011				$ 87.61
Shares of retirement and savings plans invested in company's common stock	3.7
Percentage of retirement and savings plan's assets invested in our company common stock	17.00%
Number of shares of our common stock reserved for issuance under our defined contribution and retirement savings plans	6.1
Percentage of the retirement and savings plan's assets invested in our common stock as compared to company's outstanding shares at year-end	2.00%
Combination of age and years necessary for retirement provision as related to our equity award program	65
Minimum age required for retirement eligibility as related to our equity award program	55
Minimum number of years of service for retirement eligibility as related to our equity award program	5
Employee service share based compensation tax benefit realized from exercise of stock options and restricted stock vesting	44,000,000	15,000,000	16,000,000
Common stock shares reserved for stock award plans	27.8
Common stock shares available for future grants if all grants are options	19.5
Common stock shares available for future grants if all grants are restricted shares	8.7
Outstanding intrinsic value of stock options	108,000,000
Weighted-average remaining contractual term, years	3.7
Exercisable stock options intrinsic value	50,000,000
Exercisable stock options weighted-average remaining contractual term, years	2.5
Total intrinsic value of stock options exercised	88,000,000	11,000,000	24,000,000
Cash received from stock options exercises	134,000,000	17,000,000	18,000,000
Weighted-average grant date fair value of restricted stock awards	$ 67.70	$ 49.29	$ 41.16
Fair value of shares vested	36,000,000	30,000,000	22,000,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	three
Total compensation expense not yet recognized related to nonvested restricted stock	63,000,000
Compensation expense over a weighted-average period, years	2.0
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized related to nonvested restricted stock	$ 13,000,000
Compensation expense over a weighted-average period, years	2.1
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of year for stock options to vest	3
Number of years for stock options to expire	10
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of year for stock options to vest	1
Number of years for stock options to expire	7