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Income Taxes Level 4 Net Operating Loss Carryover (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 1,728 | $ 1,894
Deferred Tax Assets, Capital Loss Carryforwards | 15 | 0
Tax Credit Carryforward, Amount | $ 742 | 640
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2020 |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2022 |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 33 | 56
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 742 | 640
Earliest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2023 |
Latest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2036 |
No expiration tax year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Amount | $ 742 |
Capital Loss Carryforward [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Amount | 44 | 0
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 4,938 | 5,412
Domestic Tax Authority [Member] | Expiring Tax Year 2020 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 1 |
Domestic Tax Authority [Member] | Expiring within Tax Years 2023 to 2036 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 4,937 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Amount | 33 | $ 56
Foreign Tax Authority [Member] | No expiration tax year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | $ 3 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 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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- 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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 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 Reference 4: 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 + Details
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