Retirement Plans - Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jul. 02, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Changes recognized in accumulated other comprehensive loss:
Net amount recognized		$ (6)	$ (16)	$ 45
Prior year correction
Changes recognized in accumulated other comprehensive loss:
Amounts reclassified from other comprehensive loss, before tax	$ 22	0	0	22
Pension Benefits
Changes recognized in accumulated other comprehensive loss:
Actuarial gain (loss)		6	0	(63)
Prior year correction		0	0	(22)
Amortization of net loss (gain)		3	4	8
Settlements		0	18	4
Net amount recognized		$ 9	$ 22	$ (73)

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- Definition

Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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- Definition

Other comprehensive income loss defined benefit plan net settlements net of tax.

+ References

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Other comprehensive income loss defined benefit plan prior year correction net of tax.

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