Retirement Plans Funded Status of the Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Change in benefit obligation:
Actuarial loss (gain)	$ 100	$ (97)	$ 76
Change in plan assets:
Fair value of plan assets as of beginning of year	836
Employer contribution		71
Fair value of plan assets as of end of year	923	836
Amounts recognized in the consolidated balance sheets consist of the following:
Accrued benefit obligation—noncurrent	(7)	(40)
Pension Benefits
Change in benefit obligation:
Benefit obligation as of beginning of year	871	976	966
Service cost	2	2	2
Interest cost	37	36	40
Actuarial loss (gain)	100	(97)	76
Settlements	(84)	0	(87)
Benefit disbursements	(23)	(46)	(21)
Benefit obligation as of end of year	903	871	976
Change in plan assets:
Fair value of plan assets as of beginning of year	836	851	799
Return on plan assets	193	(40)	124
Employer contribution	1	71	36
Settlements	(84)	0	(87)
Benefit disbursements	(23)	(46)	(21)
Fair value of plan assets as of end of year	923	836	851
Net funded status	20	(35)	(125)
Amounts recognized in the consolidated balance sheets consist of the following:
Assets for Plan Benefits, Defined Benefit Plan	22	0	0
Accrued benefit obligation—current	0	0	(1)
Accrued benefit obligation—noncurrent	(2)	(35)	(124)
Net amount recognized in the consolidated balance sheets	20	(35)	(125)
Amounts recognized in accumulated other comprehensive loss consist of the following:
Net loss	129	190	199
Net loss recognized in accumulated other comprehensive loss	129	190	199
Accumulated benefit obligation	899	869	974
Other Postretirement Plans
Change in benefit obligation:
Benefit obligation as of beginning of year	6	7	7
Benefit disbursements	(1)	(1)	(1)
Other	1	0	1
Benefit obligation as of end of year	6	6	7
Change in plan assets:
Fair value of plan assets as of beginning of year	0	0	0
Employer contribution	1	1	1
Benefit disbursements	(1)	(1)	(1)
Fair value of plan assets as of end of year	0	0	0
Net funded status	(6)	(6)	(7)
Amounts recognized in the consolidated balance sheets consist of the following:
Accrued benefit obligation—current	(1)	(1)	(1)
Accrued benefit obligation—noncurrent	(5)	(5)	(6)
Net amount recognized in the consolidated balance sheets	(6)	(6)	(7)
Amounts recognized in accumulated other comprehensive loss consist of the following:
Net loss	1	1	1
Net loss recognized in accumulated other comprehensive loss	$ 1	$ 1	$ 1