Reorganization of Business - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017 USD ($) employee	Jul. 02, 2016 USD ($)	Jul. 01, 2017 USD ($) employee	Jul. 02, 2016 USD ($)	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 3	$ 44	$ 22	$ 67
Restructuring, additional charges			27
Restructuring reserve	68		68		$ 102
Restructuring charges settled with cash			56
Restructuring, reversal of accruals no longer needed			5	4
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges				46
Restructuring, additional charges	8	22	23
Restructuring reserve	$ 58		58		95
Restructuring charges settled with cash			$ 55
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	500		500
Restructuring, reversal of accruals no longer needed	$ 5		$ 5
Exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring, additional charges		5	4	5
Restructuring reserve	10		10		$ 7
Restructuring charges settled with cash			1
Restructuring, reversal of accruals no longer needed			0
Asset Impairment Due to Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment of assets				20
Building | Asset Impairment Due to Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment of assets		17		17
Corporate aircraft | Asset Impairment Due to Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment of assets				3
Other charges
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	1	36	16	42
Costs of sales
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 2	$ 8	$ 6	$ 25