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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 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Mortgage loans, net | $ 902 | $ 746 |  |
Assets held for sale | 36,829 | 42,131 |  |
Financial liabilities |  |  |  |
Long-term debt | 7,996 | 7,825 |  |
Liability for collateral | 1,096 | 914 | $ 928 | $ 1,298
Liabilities held for sale | 33,383 | 33,325 |  |
Significant unobservable inputs (Level 3) | Amortized cost, net |  |  |  |
Financial assets |  |  |  |
Mortgage loans, net | 902 | 746 |  |
Bank loans | 1,260 | 772 |  |
Agent loans | 607 | 0 |  |
Assets held for sale | 3,278 | 4,206 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 33 | 0 |  |
Liabilities held for sale | 8,099 | 8,130 |  |
Significant unobservable inputs (Level 3) | Fair value |  |  |  |
Financial assets |  |  |  |
Mortgage loans, net | 948 | 792 |  |
Bank loans | 1,286 | 803 |  |
Agent loans | 606 | 0 |  |
Assets held for sale | 3,484 | 4,440 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 35 | 0 |  |
Liabilities held for sale | 8,950 | 9,424 |  |
Significant other observable inputs (Level 2) | Amortized cost, net |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 7,577 | 7,825 |  |
Liability for collateral | 1,096 | 914 |  |
Significant other observable inputs (Level 2) | Fair value |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 9,046 | 9,489 |  |
Liability for collateral | $ 1,096 | $ 914 |  |

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- Definition Amount classified as liabilities attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + 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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