Revenues (Narrative) (Details) $ in Millions	12 Months Ended
	Jan. 03, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation amount	$ 10,900
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized under ASC 842	118
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-04
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation amount	$ 6,600
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-02
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation amount	$ 1,700
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation amount	$ 2,600
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period