Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						0 Months Ended			1 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010	Mar. 31, 2001	Nov. 15, 2009 Ten-Year 6.6% U.S. Dollar Notes Due 2011 [Member]	May 16, 2011 Seven-Year 3.25% U.S. Dollar Notes Due 2018 [Member]	Feb. 24, 2007 Euro Commercial Paper [Member] d	Dec. 29, 2007 Five-Year 5.125% U.S. Dollar Notes Due 2012 [Member]	Mar. 06, 2008 Five-Year 4.25% U.S. Dollar Notes Due 2013 [Member]	Mar. 31, 2011 Unsecured Five-Year Credit Agreement [Member]	Mar. 31, 2011 Unsecured Four-Year Credit Agreement [Member]	Dec. 31, 2011 Unsecured Four-Year Credit Agreement [Member]	Dec. 31, 2011 Unsecured Four-Year Credit Agreement [Member] Letter of Credit [Member]	Dec. 31, 2011 Unsecured Four-Year Credit Agreement [Member] U.S. Swingline Loans [Member]	Dec. 31, 2011 Unsecured Four-Year Credit Agreement [Member] European Swingline Loans [Member]
Repayment of long-term debt	$ 945	$ 1	$ 482
Debt instrument, face amount				4,600		400		750	750
Number of days until note maturity							364
Debt instrument, stated interest rate					6.60%	3.25%		5.125%	4.25%
Line of credit facility, maximum borrowing capacity	2,200						750					2,000	75	200	400
Long-term debt	5,037	4,908
Line of credit facility, expiration date										November 2011	2015
Principal repayments on long-term debt in 2012	750
Principal repayments on long-term debt in 2013	752
Principal repayments on long-term debt in 2014	8
Principal repayments on long-term debt in 2015	1
Principal repayments on long-term debt in 2016	1,251
Principal repayments on long-term debt in 2017 and beyond	3,001
Interest paid	249	244	302
Interest expense, capitalized	$ 5	$ 2	$ 3