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Tax Matters - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits excluding associated interest | $ 5,100 | $ 5,400 |
Deferred tax assets associated with unrecognized tax benefits | 1,100 | 1,200 |
Unrecognized tax benefits, interest on income taxes expense | 103 | 208 | $ 72
Unrecognized accrued interest decrease as a result of cash payments | 16 | 4 |
Unrecognized tax benefits, interest on income taxes accrued | 1,100 | 975 |
Decrease in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit | 75 |  |
Unremitted earnings of international subsidiaries | 31,000 |  |
Noncurrent Deferred Tax Assets And Other Noncurrent Tax Assets [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Deferred tax assets associated with unrecognized tax benefits | 1,000 | 1,000 |
Deferred Tax Liabilities, Net, Noncurrent [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Deferred tax assets associated with unrecognized tax benefits | 128 | 118 |
Income Taxes Payable [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits, interest on income taxes accrued | 6 |  |
Other Taxes Payable [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits, interest on income taxes accrued | $ 1,100 | $ 975 |

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