Income Taxes (Federal Statutory) (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Income Taxes [Line Items] | ||||
| Federal tax at statutory rate | $ 3,201 | $ 5,374 | $ 5,014 | |
| State income taxes, net of federal benefit | 212 | 299 | 373 | |
| Foreign income taxed at different rates | 147 | 70 | 65 | |
| Nontaxable income attributable to noncontrolling interests | (20) | (45) | (128) | |
| Other adjustments | (138) | (229) | (67) | |
| Excess tax benefits recognized on share-based compensation | (75) | (297) | 0 | |
| Federal tax legislation | $ (12,700) | (120) | (12,682) | 0 |
| Income tax expense (benefit) | 3,380 | (7,569) | 5,298 | |
| Adjustments to uncertain and effectively settled tax positions, net [Member] | ||||
| Income Taxes [Line Items] | ||||
| Other adjustments | 144 | (62) | 24 | |
| Accrued interest on uncertain and effectively settled tax positions, net [Member] | ||||
| Income Taxes [Line Items] | ||||
| Other adjustments | $ 29 | $ 3 | $ 17 | |
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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 the 2017 tax reform legislation. No definition available.
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- Definition [Line Items] for Income Taxes [Table] No definition available.
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 foreign income tax expense (benefit). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 noncontrolling interest income (loss) exempt from income taxes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 other adjustments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 state and local income tax expense (benefit). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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