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Income Taxes, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other income tax disclosures |  |  |
Effect of unrecognized tax benefit on income tax expense | $ 28 | $ 26 | $ 25
Interest expense and penalties related to unrecognized income tax benefits | (1) | 1 | $ 3
Net accrued interest and penalties, total | 15 | $ 17 |
Federal |  |  |
Operating loss carryforwards |  |  |
Deferred income tax asset for Federal NOL carryforwards (entities not on Federal return) | $ 24 |  |
Other income tax disclosures |  |  |
All audit periods prior to this year are closed | 2013 |  |
Federal | Minimum |  |  |
Operating loss carryforwards |  |  |
Expiration of NOL carryforwards | Dec. 31, 2018 |  |
Federal | Maximum |  |  |
Operating loss carryforwards |  |  |
Expiration of NOL carryforwards | Dec. 31, 2036 |  |
State |  |  |
Operating loss carryforwards |  |  |
NOL carryforwards | $ 2,691 |  |
Deferred income tax asset for State NOL carryforwards | $ 121 |  |
Other income tax disclosures |  |  |
All audit periods prior to this year are closed | 2012 |  |
State | Minimum |  |  |
Operating loss carryforwards |  |  |
Expiration of NOL carryforwards | Dec. 31, 2017 |  |
State | Maximum |  |  |
Operating loss carryforwards |  |  |
Expiration of NOL carryforwards | Dec. 31, 2036 |  |

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