Contingencies and Commitments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Contingencies and Commitments
Aggregate amount of outstanding letter of credit arrangements and surety bonds	$ 298	$ 323
Rental expense	95	97	93
Future minimum rental commitments for non cancelable operating leases for 2014	64
Future minimum rental commitments for non cancelable operating leases for 2015	46
Future minimum rental commitments for non cancelable operating leases for 2016	36
Future minimum rental commitments for non cancelable operating leases for 2017	28
Future minimum rental commitments for non cancelable operating leases for 2018	21
Future minimum rental commitments for non cancelable operating leases for thereafter	148
Environmental liabilities
Environmental Remediation
Minimum potential environmental liabilities	40
Maximum potential environmental liabilities	170
Environmental reserves	74
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	21
Expenditures to evaluate and remediate contaminated sites	$ 12	$ 15	$ 9