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Reinsurance and Indemnification - Effects of reinsurance on property and casualty premiums (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property and casualty insurance premiums earned |  |  |
Direct | $ 40,116 | $ 39,178 | $ 36,978
Assumed | 784 | 806 | 841
Ceded | (1,383) | (1,407) | (1,306)
Net amount | 39,517 | 38,577 | 36,513
Property and casualty insurance premiums |  |  |
Property and casualty insurance premiums written |  |  |
Direct | 38,695 | 37,976 | 35,895
Assumed | 105 | 95 | 99
Ceded | (1,142) | (1,117) | (1,008)
Property and casualty insurance premiums written, net of recoverables | 37,658 | 36,954 | 34,986
Property and casualty insurance premiums earned |  |  |
Direct | 38,115 | 37,104 | 34,977
Assumed | 99 | 94 | 87
Ceded | (1,141) | (1,122) | (1,016)
Net amount | 37,073 | 36,076 | 34,048
Reinsurance ceded |  |  |
Life premiums and contract charges |  |  |
Direct | 2,001 | 2,074 | 2,001
Assumed | 685 | 712 | 754
Ceded | (242) | (285) | (290)
Life premiums and contract charges, net of recoverables | $ 2,444 | $ 2,501 | $ 2,465

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- Definition Premiums and contract charges related to life insurance, accident and health insurance and annuity contracts that are assumed and earned from another insurer as a result of reinsurance arrangements. + References No definition available. + Details
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- Definition Premiums and contract charges related to life insurance, accident and health insurance and annuity contracts that are assumed and earned by another insurer as a result of reinsurance arrangements. + References No definition available. + Details
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- Definition Premiums and contract charges related to life insurance, accident and health insurance and annuity contracts that are written and earned directly by the insurer before adding contracts assumed from other insurers or subtracting any amounts assumed by other insurers. + References No definition available. + Details
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- Definition Premiums recognized as revenue in the period on all life insurance and reinsurance contracts, as well as accident and health insurance and reinsurance contracts, after subtracting any amounts ceded to another insurer. Also includes an amount that an insurer adds to a policy's premium, or deducts from a policy's cash value or contract holder's account, as compensation for services rendered (may include fees), after subtracting any amounts ceded to another insurer. + References No definition available. + Details
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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 + Details
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- Definition Amount of written premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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