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Income Taxes (Narrative) (Details) $ / shares in Units, $ in Millions, kr in Billions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2021 DKK (kr) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2017 | Dec. 31, 2018 USD ($)
Net deferred tax liabilities |  | $ (3,563) |  | $ (3,454) |  |  |
Valuation allowance, deferred tax asset, change in amount |  | (22) |  |  |  |  |
Basis differences in investments outside the U.S. |  | $ 11,200 |  |  |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 35.00% |
Effective income tax rate |  | 16.50% | 16.50% | 18.90% | 26.40% |  |
Effective income tax rate reconciliation, other reconciling items, percent |  | 3.50% | 3.50% | 0.70% | 6.50% |  |
Income tax payments |  | $ 1,700 |  | $ 1,100 | $ 847 |  |
Employee service share-based compensation, tax benefit from exercise of stock options |  | 118 |  | 110 | 79 |  |
Excess tax benefit from share-based compensation, operating activities |  | 95 |  | 85 | 55 |  |
Net operating loss carryforwards |  | 427 |  |  |  |  |
Operating loss carryforwards, valuation allowances |  | 172 |  |  |  |  |
Deferred tax assets, valuation allowances |  | 242 |  | 264 |  |  |
Gross unrecognized tax benefits |  | 1,095 |  | 1,175 | 1,181 |  | $ 986
Unrecognized tax benefits, net of offsetting indirect tax benefits |  | 1,200 |  | 1,400 |  |  |
Unrecognized tax benefits, indirect tax benefits |  | 58 |  | 148 |  |  |
Potential interest and penalties |  | (163) |  | (354) |  |  |
Recognized potential interest and penalties |  | 182 |  | 41 | 227 |  |
Unrecognized tax benefits that would impact effective tax rate |  | 1,100 |  | 1,400 |  |  |
Estimated reduction in unrecognized tax benefits within twelve months |  | (58) |  |  |  |  |
General business and foreign tax credit |  |  |  |  |  |  |
Tax credit carryforwards |  | 117 |  |  |  |  |
Tax credit carryforward, valuation allowance |  | 58 |  |  |  |  |
Deferred tax asset, other |  |  |  |  |  |  |
Deferred tax assets, valuation allowances |  | 12 |  |  |  |  |
Domestic tax authority | IRS |  |  |  |  |  |  |
Proposed adjustments to taxable income, self-insurance, other |  |  |  | 2,700 |  |  |
Foreign tax authority |  |  |  |  |  |  |
Income tax examination, amount of tax assessments 2010-2015 |  | 317 | kr 2.1 |  |  |  |
Income tax holiday, aggregate dollar amount |  | $ 59 |  | $ 43 | $ 71 |  |
Income tax holiday, income tax benefits per diluted common share | $ / shares |  | $ 0.08 |  | $ 0.06 | $ 0.10 |  |
United States |  |  |  |  |  |  |
Net deferred tax liabilities |  | $ (2,100) |  | $ (1,900) |  |  |
Non-U.S. |  |  |  |  |  |  |
Net deferred tax liabilities |  | $ (1,500) |  | $ (1,600) |  |  |

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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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