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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Effective income tax, percent | 18.20% | 18.70% | (50.80%)
Interest expense and penalties included in other income (expense), net | $ (35) | $ (9) | $ (9)
Net operating loss carryforward recognized | 41 | 50 | $ 31
Accrued interest and penalties | 133 | 94 |
Operating loss carryforwards | 1,642 |  |
Operating loss carryforwards, subject to full valuation allowance | 410 |  |
Unrecognized tax benefits, interest on income tax expense | 456 | $ 468 |
Wright |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforwards | 1,409 |  |
Operating loss carryforwards, subject to full valuation allowance | 405 |  |
United States |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforwards | 1,509 |  |
Foreign Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforwards | 132 |  |
Tax credit carryforward, amount | 97 |  |
Tax credit carryforward, valuation allowance | $ 93 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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 The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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