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Income Taxes (Narrative) (Details) $ / shares in Units, $ in Millions, kr in Billions |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Mar. 29, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2019 DKK (kr) | Dec. 10, 2013 DKK (kr)
Net deferred tax liabilities |  |  | $ (3,454) | $ (1,652) |  |  |  |
Valuation allowance, deferred tax asset, change in amount |  |  | 3 |  |  |  |  |
Basis differences in investments outside the U.S. |  |  | $ 10,300 |  |  |  |  |
Statutory federal income tax rate | 21.00% |  | 21.00% | 21.00% | 21.00% | 35.00% |  |
Effective income tax rate |  |  | 18.90% | 26.40% | 18.80% |  |  |
Effective income tax rate reconciliation, other reconciling items, percent |  |  | 0.70% | 6.50% | 1.20% |  |  |
Income tax payments |  |  | $ 1,100 | $ 847 | $ 673 |  |  |
Employee service share-based compensation, tax benefit from exercise of stock options |  |  | 110 | 79 | 57 |  |  |
Excess tax benefit from share-based compensation, operating activities |  |  | 85 | 55 | 38 |  |  |
Income taxes receivable |  |  | 700 | 196 |  |  |  |
Net operating loss carryforwards |  |  | 452 |  |  |  |  |
Operating loss carryforwards, valuation allowances |  |  | 174 |  |  |  |  |
Deferred tax assets, valuation allowances |  |  | 264 | 261 |  |  |  |
Gross unrecognized tax benefits | $ 737 |  | 1,175 | 1,181 | 986 | $ 737 |  |
Unrecognized tax benefits, net of offsetting indirect tax benefits |  |  | 1,400 | 1,400 |  |  |  |
Unrecognized tax benefits, indirect tax benefits |  |  | 148 | 131 |  |  |  |
Potential interest and penalties |  |  | (354) | (320) |  |  |  |
Recognized potential interest and penalties |  |  | 41 | 227 | 41 |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | 1,400 | 1,300 |  |  |  |
Estimated reduction in unrecognized tax benefits within twelve months |  |  | (199) |  |  |  |  |
General business and foreign tax credit |  |  |  |  |  |  |  |
Tax credit carryforwards |  |  | 117 |  |  |  |  |
Tax credit carryforward, valuation allowance |  |  | 66 |  |  |  |  |
Deferred tax asset, other |  |  |  |  |  |  |  |
Deferred tax assets, valuation allowances |  |  | 24 |  |  |  |  |
Domestic tax authority | IRS |  |  |  |  |  |  |  |
Proposed adjustments to taxable income, self-insurance, other |  | $ 2,700 |  |  |  |  |  |
Foreign tax authority |  |  |  |  |  |  |  |
Income tax examination, amount of tax assessments 2004-2009 |  |  | 309 |  |  |  |  | kr 1.9
Income tax examination, amount of tax assessments 2010-2015 |  |  | 302 |  |  |  | kr 1.8 |
Income tax holiday, aggregate dollar amount |  |  | $ 43 | $ 71 | $ 69 |  |  |
Income tax holiday, income tax benefits per diluted common share | $ / shares |  |  | $ 0.06 | $ 0.10 | $ 0.10 |  |  |
United States |  |  |  |  |  |  |  |
Net deferred tax liabilities |  |  | $ (1,900) | $ (1,600) |  |  |  |
International |  |  |  |  |  |  |  |
Net deferred tax liabilities |  |  | $ (1,600) | $ (90) |  |  |  |

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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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