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Fair Value of Assets and Liabilities - Carrying values and fair value estimates of financial instruments not carried at fair value (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Mortgage loans, net | $ 4,774 | $ 4,817 |  |
Financial liabilities |  |  |  |
Long-term debt | 6,634 | 6,631 |  |
Liability for collateral | 1,381 | 1,829 | $ 1,871 | $ 1,458
Significant unobservable inputs (Level 3) | Amortized cost, net |  |  |  |
Financial assets |  |  |  |
Mortgage loans, net | 4,774 | 4,817 |  |
Bank loans | 1,118 | 1,204 |  |
Agent loans | 649 | 666 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 8,080 | 8,438 |  |
Significant unobservable inputs (Level 3) | Fair value |  |  |  |
Financial assets |  |  |  |
Mortgage loans, net | 5,073 | 5,012 |  |
Bank loans | 1,107 | 1,185 |  |
Agent loans | 658 | 664 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 9,318 | 9,158 |  |
Significant other observable inputs (Level 2) | Amortized cost, net |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 6,634 | 6,631 |  |
Liability for collateral | 1,381 | 1,829 |  |
Significant other observable inputs (Level 2) | Fair value |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 8,037 | 7,738 |  |
Liability for collateral | $ 1,381 | $ 1,829 |  |

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- Definition Represents the portion of other investments categorized as bank loans, as of the balance sheet date. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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