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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 | 48 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Oct. 02, 2020 USD ($) | Sep. 27, 2019 | Oct. 02, 2020 USD ($) | Sep. 27, 2019 USD ($) $ / shares | Dec. 21, 2017 | Dec. 31, 2015 USD ($) | Dec. 16, 2019 DKK (kr) | Aug. 27, 2019 DKK (kr) | 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, percent |  | (6.10%) |  | (1.10%) | 9.70% |  |  |  |  |
Net tax benefits, impact, amount |  |  |  |  | $ (227) |  |  |  |  |
Net tax benefits, impact, per diluted share | $ / shares |  |  |  |  | $ (0.31) |  |  |  |  |
Income tax examination, self-insurance programs, proposed adjustments to taxable income |  |  |  |  |  |  | $ 2,700 |  |  |
Foreign tax authority |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax examination, amount of tax assessments 2004-2009 |  | $ 292 |  | $ 292 |  |  |  |  |  | kr 1,900
Income tax examination, amount of tax assessments 2010-2012 |  | 169 |  | 169 |  |  |  |  | kr 1,100 |
Income tax examination, amount of tax assessments 2013-2015 |  | $ 120 |  | $ 120 |  |  |  | kr 761 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + 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://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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