Commitments, Contingencies and Debt Debt Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 28, 2019
Debt Instrument [Line Items]
Minimum shareholder's equity required to maintain excluding accumulated other comprehensive income/(losses)	$ 35,000
Commercial paper	0		$ 0
Repayments of long-term debt	407	$ 1
Fair value of total debt	31,600		31,100
Carrying value of total debt	$ 32,800		29,200
LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate for debt instrument	1.25%
Euro equivalent swingline facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 400
Senior unsecured revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	4,000
Maximum amount of revolving credit facility outstanding during the period	4,000	0
Amount of credit facility still outstanding at period end	4,000		$ 0
Repayments of lines of credit	0
Senior unsecured revolving credit facility, extension agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	3,900
Uncommitted revolving credit line
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	300
Amount of credit facility still outstanding at period end	0
Commercial paper
Debt Instrument [Line Items]
Maximum amount of revolving credit facility outstanding during the period	0	$ 200
Senior notes due in February 2020
Debt Instrument [Line Items]
Repayments of long-term debt	$ 405