Reorganization of Business (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016 USD ($) employee	Jul. 04, 2015 USD ($)	Jul. 02, 2016 USD ($) employee	Jul. 04, 2015 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 44	$ 16	$ 67	$ 30
Restructuring, additional charges			51
Restructuring, reversal of accruals no longer needed			4
Restructuring reserve	65		65		$ 60
Restructuring charges settled with cash			42
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring, additional charges	22	16	46	26
Restructuring, reversal of accruals no longer needed			4
Restructuring reserve	$ 54		54		51
Restructuring charges settled with cash			$ 39
Number of Employees Impacted By Reorganization of Business
Restructuring charges in the period for total employee severance (in number of employees) | employee			300
Number of employees expected to be paid (in number of employees) | employee	400		400
Impairments
Restructuring Cost and Reserve [Line Items]
Restructuring, additional charges			$ 20
Building Impairment Due to Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring, additional charges	$ 17
Exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring, additional charges	5		5	4
Restructuring, reversal of accruals no longer needed			0
Restructuring reserve	11		11		$ 9
Restructuring charges settled with cash			3
Other charges
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	36	13	42	26
Costs of sales
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 8	$ 3	25	$ 4
Building | Building Impairment Due to Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment of assets			17
Corporate aircraft | Building Impairment Due to Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment of assets			3
Continuing Operations | Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring, reversal of accruals no longer needed			$ 4