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Variable Interest Entities ("VIE's") (Narrative) (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) contract
Variable Interest Entity [Line Items] |  |  |
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets | $ 2,210,000,000 |  | $ 2,230,000,000
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects | 2,000,000 | $ 3,000,000 |
Number of Instruments, Liabilities | contract |  |  | 1
Notional Amounts, Liabilities |  |  | $ 0
Carrying Value, Assets |  |  | 200,000,000
Carrying Value, Liabilities | 0 |  | 0
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 | 1,400,000,000 |  | 1,300,000,000
Carrying Amount Of Investments In Qualified Affordable Housing Projects | $ 32,000,000 |  | $ 37,000,000

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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 Quantifies the carrying value of the consolidated variable interest entities' assets. + References No definition available. + Details
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- Definition Quantifies the carrying value of the consolidated variable interest entities' liabilities. + References No definition available. + Details
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- Definition The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the consolidated variable interest entity. + References No definition available. + Details
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- Definition Aggregate notional amount of derivative liabilities held by the consolidated variable interest entity. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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- Definition Amount of investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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