Income Taxes (Details) - USD ($) $ in Millions			3 Months Ended	6 Months Ended
	Jun. 29, 2015	Jun. 28, 2015	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Effective Tax Rate Reconciliation [Abstract]
Effective income tax rate				18.00%	32.00%
Effective income tax rate excluding Libya				15.00%	34.00%
Deferred tax expense				$ (185)	$ 173
Foreign Tax Authority [Member] | Alberta Government [Member]
Effective Tax Rate Reconciliation [Abstract]
Provincial corporate tax rate	12.00%	10.00%
Deferred tax expense			$ 135	135
CANADA
Effective Tax Rate Reconciliation [Abstract]
Earnings of foreign subsidiaries no longer permanently reinvested			$ 1,000	$ 1,000