Contingencies and Commitments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Contingencies and Commitments
Aggregate amount of outstanding letter of credit arrangements and surety bonds	$ 323	$ 260
Rental expense	97	93	92
Future minimum rental commitments for non cancelable operating leases for 2013	58
Future minimum rental commitments for non cancelable operating leases for 2014	46
Future minimum rental commitments for non cancelable operating leases for 2015	37
Future minimum rental commitments for non cancelable operating leases for 2016	31
Future minimum rental commitments for non cancelable operating leases for 2017	22
Future minimum rental commitments for non cancelable operating leases for thereafter	150
Environmental liabilities
Environmental Remediation
Minimum potential environmental liabilities	44
Maximum potential environmental liabilities	188
Environmental reserves	73
Estimated minimum period over which accrued environmental remediation liabilities are likely to be paid	5 years
Estimated maximum period over which over which accrued environmental remediation liabilities are likely to be paid	10 years
Accrued environmental remediation liabilities classified as current liabilities	20
Expenditures to evaluate and remediate contaminated sites	$ 15	$ 9	$ 10