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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes - Narrative (Details) |  |  |  |  |  |
Federal statutory rate |  |  | 35.00% | 35.00% | 35.00% |
Income Tax Expense (Benefit) |  |  | $ 8,885 | $ 3,609 | $ 3,553 |
Other accrued liabilities |  | $ 3,370 | 3,370 | 2,991 |  |
Long-term income taxes payable |  | 6,794 | 6,794 | 1,753 |  |
Deferred Tax Assets, Valuation Allowance |  | 162 | 162 | 126 | 6 |
Total Gross Unrecognized Tax Benefits |  | 2,181 | 2,181 | 1,852 | $ 1,350 | $ 661
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 1,800 | 1,800 | 1,800 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 112 | 112 | $ 50 |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  | 800 | $ 800 |  |  |
Tax Cuts and Jobs Act of 2017 [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Federal statutory rate |  |  | 21.00% |  |  |
Income Tax Expense (Benefit) |  | 5,500 |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | 308 |  |  |  |
Taxes Payable |  | 6,100 | $ 6,100 |  |  |
Other accrued liabilities |  | 487 | 487 |  |  |
Long-term income taxes payable |  | 5,600 | 5,600 |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Operating Loss Carryforwards |  | 1,100 | 1,100 |  |  |
Tax Credit Carryforward, Amount |  | 107 | 107 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Operating Loss Carryforwards |  | 627 | 627 |  |  |
Tax Credit Carryforward, Amount |  | 355 | $ 355 |  |  |
Transition Tax [Member] | Tax Cuts and Jobs Act of 2017 [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Income Tax Expense (Benefit) |  | $ 5,800 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Foreign Earnings Repatriated | $ 28,000 |  |  |  |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(b)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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