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Tax Matters - Reconciliation of Gross Unrecognized Tax Benefits - Footnotes (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | $ 6,259 | [1] | $ 6,558 | [1] | $ 5,826 | $ 5,919
Income Taxes Payable [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | 11 |  | 1 |  |  |
Noncurrent Deferred Tax Assets And Other Noncurrent Tax Assets [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | 47 |  | 123 |  |  |
Noncurrent Deferred Tax Liabilities [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | 3,200 |  | 3,300 |  |  |
Other Taxes Payable [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | $ 3,000 |  | $ 3,200 |  |  |
[1] | In 2018, included in Income taxes payable ($11 million), Current tax assets ($1 million), Noncurrent deferred tax assets and other noncurrent tax assets ($47 million), Noncurrent deferred tax liabilities ($3.2 billion) and Other taxes payable ($3.0 billion). In 2017, included in Income taxes payable ($1 million), Noncurrent deferred tax assets and other noncurrent tax assets ($123 million), Noncurrent deferred tax liabilities ($3.3 billion) and Other taxes payable ($3.2 billion).

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