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Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 482 | $ 427
Tax credit carryforwards | 3,126 | $ 3,059
Federal [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 158 |
Tax credit carryforwards | 2,779 |
State [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 232 |
Tax credit carryforwards | 347 |
Tax credit carryforward with indefinite expiration period | 188 |
Foreign [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 92 |
Operating loss carryforwards with indefinite expiration period | $ 64 |

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