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Variable Interest Entities (Narrative) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |  |
Gains (losses) for consolidated variable interest entities | $ 0 |  | $ 0
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets | 2,204,000,000 |  | 2,296,000,000
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects | 1,000,000 | $ 2,000,000 |
Limited Partnerships and Limited Liability Companies [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets | 1,700,000,000 |  | 1,500,000,000
Carrying Amount Of Investments In Qualified Affordable Housing Projects | $ 25,000,000 |  | $ 31,000,000

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- Definition The carrying amount of our investments in qualified affordable housing projects which are recognized in other investments on our Consolidated Balance Sheets. + References No definition available. + Details
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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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