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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 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Mortgage loans | $ 4,694 | $ 4,670 |  |
Financial liabilities |  |  |  |
Long-term debt | 6,630 | 6,451 |  |
Liability for collateral | 2,087 | 1,458 | $ 1,403 | $ 1,124
Significant unobservable inputs (Level 3) | Carrying value |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 4,694 | 4,670 |  |
Bank loans | 1,223 | 1,350 |  |
Agent loans | 663 | 620 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 8,619 | 9,250 |  |
Significant unobservable inputs (Level 3) | Fair value |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 4,876 | 4,703 |  |
Bank loans | 1,199 | 1,298 |  |
Agent loans | 666 | 617 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 9,435 | 9,665 |  |
Significant other observable inputs (Level 2) | Carrying value |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 6,630 | 6,451 |  |
Liability for collateral | 2,087 | 1,458 |  |
Significant other observable inputs (Level 2) | Fair value |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 7,710 | 6,708 |  |
Liability for collateral | $ 2,087 | $ 1,458 |  |

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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=109500613&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=119400593&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=6876686&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=6877327&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=119400593&loc=d3e572229-122910 + Details
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