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Income Taxes Level 4 Net Operating Loss Carryover (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 91 | $ 0
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 1,618 | 1,894
Deferred Tax Assets, Capital Loss Carryforwards | 32 | 0
Expiring Tax Year 2020 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 1 |
Earliest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2020 |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2021 |
Latest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2036 |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2035 |
Expiring within Tax Years 2023 to 2036 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 4,623 |
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 4,624 | 5,412
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 3 | 48
Deferred Tax Assets, Operating Loss Carryforwards | $ 0 | $ 9

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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