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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate on income from operations | 25.00% |  | 26.00% |  |
Effective income tax rate, estimated |  |  | 24.00% |  |
U.S. statutory federal rate, expected (benefit) provision |  |  | 35.00% |  |
U.S. taxes on foreign unremitted earnings |  |  | (7.00%) |  |
Noncontrolling interests |  |  | (10.00%) |  |
Deferred Tax Assets, Valuation Allowance | $ 526 |  | $ 526 |  | $ 538
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (13) | $ 10 | (12) | $ 32 |
Liability for Uncertain Tax Positions, Noncurrent | 235 |  | 235 |  | $ 228
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | $ 8 | $ (3) | $ 7 |  |
Maximum [Member] |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  | $ 1 |

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