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Income Taxes Uncertain Tax Positions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unrecognized Tax Benefits [Roll Forward] |  |  |  |
Balance at beginning of period |  | $ 1,557 | $ 1,182 | $ 1,337
Additions to current year tax positions |  | 292 | 160 | 49
Additions to prior years' tax positions |  | 264 | 448 | 96
Reductions to prior years' tax positions |  | (244) | (195) | (192)
Reductions in tax positions due to lapse of statutory limitations |  | (38) | (44) | (103)
Settlements |  | (450) | (11) | (1)
Other |  | (40) | 17 | (4)
Balance at end of period | $ 1,557 | 1,341 | 1,557 | $ 1,182
Unrecognized tax benefit that would favorably affect effective tax rate | 390 | 991 | 390 |
Income tax related interest and penalties accrual | 152 | 116 | 152 |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax expense related to tax reform legislation | $ 7,300 |  | 7,300 |
Tax expense related to tax reform legislation, updated |  |  | $ 7,100 |
Germany [Member] | Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards |  | 3,300 |  |
Deferred tax assets |  | $ 1,000 |  |

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- Definition Effective Income Tax Rate Reconciliation, Effect of Tax Cuts and Jobs Act of 2017, Incomplete Accounting Adjustment, Amount + References No definition available. + Details
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- Definition Effective Income Tax Rate Reconciliation, Effect of Tax Cuts and Jobs Act of 2017, Incomplete Accounting Adjustment, Amount Updated + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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