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Income Taxes (Narrative) (Details) $ / shares in Units, kr in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended | 48 Months Ended |
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Dec. 31, 2017 | Sep. 27, 2019 | Sep. 28, 2018 USD ($) $ / shares | Sep. 27, 2019 USD ($) $ / shares | Sep. 28, 2018 USD ($) $ / shares | Dec. 21, 2017 | Dec. 31, 2015 USD ($) | Dec. 31, 2015 DKK (kr) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 DKK (kr) | Dec. 31, 2015 USD ($) | Dec. 10, 2013 USD ($) | Dec. 10, 2013 DKK (kr)
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory income tax rate, percent | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 35.00% |  |  |  |  |  |  |
Net tax benefits, impact, amount |  |  | $ (23) | $ 227 | $ (9) |  |  |  |  |  |  |  |
Net tax benefits, impact, per diluted share | $ / shares |  |  | $ (0.03) | $ 0.31 | $ (0.01) |  |  |  |  |  |  |  |
Net tax benefits, impact, percent |  |  | (2.90%) | 9.20% |  |  |  |  |  |  |  |  |
Income tax examination, proposed adjustments to taxable income |  |  |  |  |  |  |  |  |  |  | $ 2,700 |  |
Foreign tax authority |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax examination, amount of tax assessments |  |  |  |  |  |  |  |  |  |  |  | $ 256 | kr 1,700
Income tax examination, amount of potential additional tax assessments |  |  |  |  |  |  | $ 108 | kr 735 | $ 152 | kr 1,000 |  |  |

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- Definition Income tax assessment received imposing withholding tax and interest related to accrued interest on borrowings. + References No definition available. + Details
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- Definition Income Tax Examination, Self-insurance Programs, Proposed Adjustments to Taxable Income + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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