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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes - Narrative (Details) |  |  |  |  |  |
Federal statutory rate |  |  | 21.00% | 21.00% | 35.00% |
Income Tax Expense (Benefit) |  |  | $ (204) | $ 2,339 | $ 8,885 |
Deferred Tax Liabilities, Intangible Assets | $ 1,401 | $ 1,656 | 1,401 | 1,656 |  |
Deferred Tax Assets, Intangible Assets | 1,232 | 0 | 1,232 | 0 |  |
Income taxes payable |  |  | 272 | (1,459) | 5,497 |
Other accrued liabilities | 3,074 | 3,139 | 3,074 | 3,139 |  |
Long-term income taxes payable | 6,115 | 5,922 | 6,115 | 5,922 |  |
Deferred Tax Assets, Valuation Allowance | 217 | 331 | 217 | 331 |  |
Total Gross Unrecognized Tax Benefits | 2,031 | 1,595 | 2,031 | 1,595 | 2,181 | $ 1,852
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1,600 | 1,300 | 1,600 | 1,300 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  | 105 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 259 | 154 | 259 | 154 |  |
Tax Adjustments, Settlements, and Unusual Provisions | 114 |  |  |  |  |
Tax Cuts and Jobs Act of 2017 [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ 5,500 |
Domestic Tax Authority [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Operating Loss Carryforwards | 231 |  | 231 |  |  |
Tax Credit Carryforward, Amount | 88 |  | 88 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Operating Loss Carryforwards | 1,400 |  | 1,400 |  |  |
Tax Credit Carryforward, Amount | 543 |  | 543 |  |  |
Intangible Asset Transfer [Member] |  |  |  |  |  |
Income Taxes - Narrative (Details) |  |  |  |  |  |
Income Tax Expense (Benefit) | (1,200) | 588 |  |  |  |
Deferred Tax Liabilities, Intangible Assets |  | $ 588 |  | $ 588 |  |
Deferred Tax Assets, Intangible Assets | $ 1,200 |  | $ 1,200 |  |  |

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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://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(a)(15)(b)(1)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: 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(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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