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Postretirement Benefit Plans - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 29, 2019 | Mar. 30, 2018 | Mar. 29, 2019 | Mar. 30, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Dec. 31, 2016
Pension |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined benefit plan, qualified employer contribution |  | $ 301,000,000 |  | $ 301,000,000 |  |  |
Pension | U.S. |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined benefit plan, qualified employer contribution | $ 0 |  | $ 0 |  |  |  |
Defined benefit plan, voluntary employer contribution |  | $ 300,000,000 |  |  | $ 400,000,000 |  |
Defined benefit plans, estimated future employer contributions in current fiscal year | $ 0 |  | $ 0 |  |  |  |
U.S. SRP | U.S. |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Value of defined benefit pension plan assets |  |  |  |  |  | $ 4,600,000,000 |
Projected benefit obligation of defined pension plan |  |  |  |  |  | $ 5,200,000,000 |
Cash balance percentage to replace frozen benefits under defined pension plan |  |  |  |  |  |  | 1.00%

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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