Retirement Plans - Funded Status of the Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Change in benefit obligation:
Actuarial (gain) loss	$ (97)	$ 76	$ 73
Change in plan assets:
Fair value of plan assets at beginning of year	851
Employer contribution	71
Fair value of plan assets at end of year	836	851
Amounts recognized in the consolidated balance sheets consist of the following:
Accrued benefit obligation—noncurrent	(40)	(130)
Pension Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	976	966	863
Service cost	2	2	4
Interest cost	36	40	41
Actuarial (gain) loss	(97)	76	73
Prior year correction	0	0	22
Settlements	0	(87)	(16)
Benefit disbursements	(46)	(21)	(21)
Benefit obligation at end of year	871	976	966
Change in plan assets:
Fair value of plan assets at beginning of year	851	799	742
Return on plan assets	(40)	124	58
Employer contribution	71	36	36
Settlements	0	(87)	(16)
Benefit disbursements	(46)	(21)	(21)
Fair value of plan assets at end of year	836	851	799
Net funded status	(35)	(125)	(167)
Amounts recognized in the consolidated balance sheets consist of the following:
Accrued benefit obligation—current	0	(1)	(1)
Accrued benefit obligation—noncurrent	(35)	(124)	(166)
Net amount recognized in the consolidated balance sheets	(35)	(125)	(167)
Amounts recognized in accumulated other comprehensive loss consist of the following:
Net loss	190	199	221
Net loss recognized in accumulated other comprehensive loss	190	199	221
Accumulated benefit obligation	869	974	963
Amounts expected to be amortized from accumulated other comprehensive loss in the next fiscal year:
Net loss	4
Net expected to be amortized	4
Other Postretirement Plans
Change in benefit obligation:
Benefit obligation at beginning of year	7	7	7
Benefit disbursements	(1)	(1)	(1)
Other	0	1	1
Benefit obligation at end of year	6	7	7
Change in plan assets:
Fair value of plan assets at beginning of year	0	0	0
Employer contribution	1	1	1
Benefit disbursements	(1)	(1)	(1)
Fair value of plan assets at end of year	0	0	0
Net funded status	(6)	(7)	(7)
Amounts recognized in the consolidated balance sheets consist of the following:
Accrued benefit obligation—current	(1)	(1)	(1)
Accrued benefit obligation—noncurrent	(5)	(6)	(6)
Net amount recognized in the consolidated balance sheets	(6)	(7)	(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