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Investments (Payables For Collateral On Investments) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Carrying Value Of Payables For Collateral On Investments [Abstract] |  |
Collateral payable for derivative investments | $ 3,174 | $ 1,388
Securities pledged under securities lending agreements | 131 | 114
Investments pledged for Federal Home Loan Bank of Indianapolis ('FHLBI') | 3,130 | 3,580
Total payables for collateral on investments | 6,435 | 5,082
Fair Value Of Related Investments Or Collateral [Abstract] |  |
Collateral payable for derivative investments | 3,174 | 1,388
Securities pledged under securities lending agreements | 127 | 110
Investments pledged for Federal Home Loan Bank of Indianapolis('FHLBI') | 5,029 | 5,480
Total payables for collateral on investments | $ 8,330 | $ 6,978
Percentage of the fair value of domestic securities obtained as collateral under securities lending agreements. | 102.00% |
Percentage of the fair value of foreign securities obtained as collateral under securities lending agreements. | 105.00% |
Maximum [Member] |  |
Fair Value Of Related Investments Or Collateral [Abstract] |  |
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities | 115.00% |
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan | 175.00% |
Minimum [Member] |  |
Fair Value Of Related Investments Or Collateral [Abstract] |  |
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities | 105.00% |
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan | 155.00% |

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- Definition This item represents the percentage of the fair value of AFS securities obtained as collateral pledged. + References No definition available. + Details
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- Definition This item represents the percentage of the fair value of Mortgage loans obtained as collateral pledged. + References No definition available. + Details
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- Definition This item represents the percentage of the fair value of domestic securities obtained as collateral under securities lending agreements + References No definition available. + Details
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- Definition This item represents the percentage of the fair value of foreign securities obtained as collateral under securities lending agreements + References No definition available. + Details
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- Definition When entering into a derivative transaction, the amount of cash received as collateral from a counterparty. + References No definition available. + Details
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- Definition The fair value of cash received as collateral from a counterparty. + References No definition available. + Details
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- Definition The amount of cash received as security in return for loaning securities to Federal Home Loan Bank of Indianapolis. + References No definition available. + Details
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- Definition The fair value of investments loaned to Federal Home Loan Bank of Indianapolis as of the balance sheet date. + References No definition available. + Details
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- Definition The amount of cash received as security in return for loaning securities to another party under securities lending agreements. + References No definition available. + Details
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- Definition The fair value of investments loaned to another party under securities lending agreements as of the balance sheet date. + References No definition available. + Details
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- Definition The total fair value of investments related to payables for collateral on investments as of the balance sheet date. + References No definition available. + Details
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- Definition The amount of cash received as security in return for loaning securities to another party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(11)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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