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Income Taxes (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Tax [Line Items] |  |  |  |
Income tax rate | 36.70% |  | 35.40% |
Increase in income tax percentage | 3.5 |  | 0.8 |
Reversal of foreign tax credits |  |  | $ 41,000,000 |
Unrecognized tax benefits | $ 184,000,000 |  | 184,000,000 | $ 158,000,000
Unrecognized tax benefits that would impact the effective tax rate | 82,000,000 |  | 82,000,000 | 76,000,000
Unrecognized tax benefits that would impact deferred taxes | 102,000,000 |  | 102,000,000 | 82,000,000
Possible decrease in unrecognized tax benefits | $ 140,000,000 |  | 140,000,000 |
Tax Year 2007 Through Tax Year 2009 [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Reversal of tax reserves |  |  | $ (59,000,000) |
PMI [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Unrecognized tax benefits |  |  |  | $ 0
PMI [Member] | Tax Year 2007 Through Tax Year 2009 [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Net tax benefits |  | $ (41,000,000) |  |

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