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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosures [Line Items] |  |  |  |
Effective tax rate | 41.00% | 27.00% | 33.00% |
Increase (decrease) in valuation allowance | $ (103) | $ (93) |  |
Valuation allowance | 894 | 997 |  |
Tax benefits related to tax status of operations in countries subject to reduced tax rates | 21 | 38 | $ 70 |
Income tax expense | $ (465) | $ (419) | $ (343) |
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share) | $ 0.02 | $ 0.04 | $ 0.09 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued: |  |  |  |
Interest on income taxes accrued | $ 8 | $ 14 |  |
Income tax penalties accrued | 0 | 1 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense: |  |  |  |
Interest on income taxes expense | 0 | 3 | $ (4) |
Income tax penalties expense | 0 | 0 | (3) |
Uncertain Tax Positions Additional Disclosures: |  |  |  |
Unrecognized tax benefits | 373 | 395 | 392 | $ 475
Unrecognized tax benefits that would impact effective tax rate | 343 | 366 | 360 |
Unrecognized tax benefits that would impact effective tax rate portion with attributes warranting full valuation allowance | 24 | $ 24 | $ 26 |
Unrecognized tax benefits anticipated to result in net decrease of unrecognized tax benefits within 12 months, minimum | 15 |  |  |
Unrecognized tax benefits anticipated to result in net decrease of unrecognized tax benefits within 12 months, maximum | 25 |  |  |
Federal |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Operating loss carryforwards | 3,500 |  |  |
Operating loss carryforwards amount related to stock option deductions to be recognized in APIC | 87 |  |  |
State and Local Jurisdiction |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Operating loss carryforwards | 8,400 |  |  |
Foreign Tax Authority |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Operating loss carryforwards | 3,500 |  |  |
General Business Tax Credit Carryforward |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Tax credit carryforward | 18 |  |  |
Federal Alternative Minimum Tax |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Tax credit carryforward | 5 |  |  |
Foreign Jurisdictions |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Tax credit carryforward | 32 |  |  |
Year 2018 to 2025 | Foreign Jurisdictions |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Tax credit carryforward | 24 |  |  |
No Expiration |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Tax credit carryforward | 8 |  |  |
VIET NAM |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Income tax expense | $ 8 |  |  |
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share) | $ 0.01 |  |  |
2015 through 2018 [Member] | VIET NAM |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Effective tax rate | 0.00% |  |  |
2019 through 2027 [Member] [Member] | VIET NAM |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Effective tax rate | 5.00% |  |  |
2028 and beyond [Member] [Member] | VIET NAM |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |
Effective tax rate | 10.00% |  |  |

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