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Future Policy Benefits - Transition Tables (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | $ 196,406 | $ 187,222 |  | $ 224,358 |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | $ (6,565)
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 200,091
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | (7,911) |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | (176) |
FPB traditional and limited-payment contracts |  |  |  | 214,694 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 719 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | (7,490) |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | (4,658) |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 34,119 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 4,658 |
Ceded Recoverables on traditional and limited-payment contracts |  |  |  | 1,684 |
Effect of remeasurement of the ceded recoverable to an upper-medium grade discount rate |  |  |  | 351 |
Adjustments for loss contracts (with net premiums in excess of gross premiums) under the modified retrospective approach |  |  |  | 32 |
Adjustments for the cumulative effect of adoption on ceded recoverables on traditional and limited-payment contract |  |  |  | 14 |
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance |  |  |  | 5,006 | 6,565
Ceded recoverables on additional insurance liabilities |  |  |  | 720 | 727
Ceded Recoverable Reclassification of carrying amount of contracts and contract features that are reinsured market risk benefits |  |  |  | (8) |
Ceded Recoverable Adjustments for the cumulative effect of adoption on ceded recoverables on additional insurance liabilities |  |  |  | 1 |
Additional Insurance Liabilities Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | (1,642) |
Additional Insurance Liabilities Adjustments for the cumulative effect of adoption on additional insurance liabilities |  |  |  | 83 |
Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 206,656
Ceded Recoverables on traditional and limited-payment contracts |  |  |  |  | 1,287
Fixed & Immediate Annuities | Retirement and Income Solutions |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 64,324 | 58,495 | $ 63,681 |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | (4)
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 66,026
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | (5,914) |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
FPB traditional and limited-payment contracts |  |  |  | 65,970 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 337 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | (7,416) |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | (2,897) |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 15,834 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 2,897 |
Ceded Recoverables on traditional and limited-payment contracts |  |  |  | 344 |
Effect of remeasurement of the ceded recoverable to an upper-medium grade discount rate |  |  |  | 135 |
Adjustments for loss contracts (with net premiums in excess of gross premiums) under the modified retrospective approach |  |  |  | 0 |
Adjustments for the cumulative effect of adoption on ceded recoverables on traditional and limited-payment contract |  |  |  | 6 |
Fixed & Immediate Annuities | Retirement and Income Solutions | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 66,030
Ceded Recoverables on traditional and limited-payment contracts |  |  |  |  | 203
Whole and Term Life & Endowments | Asia |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 12,874 | 12,792 | 18,472 |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | 0
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 17,990
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | 0 |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
FPB traditional and limited-payment contracts |  |  |  | 22,206 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 51 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | 4 |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | (225) |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 4,386 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 225 |
Ceded Recoverables on traditional and limited-payment contracts |  |  |  | (15) |
Effect of remeasurement of the ceded recoverable to an upper-medium grade discount rate |  |  |  | (15) |
Adjustments for loss contracts (with net premiums in excess of gross premiums) under the modified retrospective approach |  |  |  | 0 |
Adjustments for the cumulative effect of adoption on ceded recoverables on traditional and limited-payment contract |  |  |  | 0 |
Whole and Term Life & Endowments | Asia | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 17,990
Ceded Recoverables on traditional and limited-payment contracts |  |  |  |  | 0
Accident & health insurance | Asia |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 10,712 | 10,040 | 15,399 |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | 0
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 16,330
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | 0 |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
FPB traditional and limited-payment contracts |  |  |  | 16,125 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 154 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | 47 |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | (691) |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 285 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 691 |
Ceded Recoverables on traditional and limited-payment contracts |  |  |  | (36) |
Effect of remeasurement of the ceded recoverable to an upper-medium grade discount rate |  |  |  | (66) |
Adjustments for loss contracts (with net premiums in excess of gross premiums) under the modified retrospective approach |  |  |  | 0 |
Adjustments for the cumulative effect of adoption on ceded recoverables on traditional and limited-payment contract |  |  |  | (2) |
Accident & health insurance | Asia | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 16,330
Ceded Recoverables on traditional and limited-payment contracts |  |  |  |  | 32
Fixed Annuity | Latin America |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 9,637 | 9,265 | 7,343 |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | 0
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 8,393
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | (295) |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
FPB traditional and limited-payment contracts |  |  |  | 10,517 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 121 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | (1) |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | (570) |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 2,869 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 570 |
Ceded Recoverables on traditional and limited-payment contracts |  |  |  | 0 |
Effect of remeasurement of the ceded recoverable to an upper-medium grade discount rate |  |  |  | 0 |
Adjustments for loss contracts (with net premiums in excess of gross premiums) under the modified retrospective approach |  |  |  | 0 |
Adjustments for the cumulative effect of adoption on ceded recoverables on traditional and limited-payment contract |  |  |  | 0 |
Fixed Annuity | Latin America | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 8,393
Ceded Recoverables on traditional and limited-payment contracts |  |  |  |  | 0
Long-term Care | MetLife Holdings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 15,240 | 13,845 | 20,569 |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | 0
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 14,281
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | (1,210) |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
FPB traditional and limited-payment contracts |  |  |  | 21,341 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 0 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | 0 |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | 0 |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 8,270 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 0 |
Ceded Recoverables on traditional and limited-payment contracts |  |  |  | 0 |
Effect of remeasurement of the ceded recoverable to an upper-medium grade discount rate |  |  |  | 0 |
Adjustments for loss contracts (with net premiums in excess of gross premiums) under the modified retrospective approach |  |  |  | 0 |
Adjustments for the cumulative effect of adoption on ceded recoverables on traditional and limited-payment contract |  |  |  | 0 |
Long-term Care | MetLife Holdings | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 14,281
Ceded Recoverables on traditional and limited-payment contracts |  |  |  |  | 0
Participating Life Insurance Contract | MetLife Holdings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 49,543 | 50,371 |  |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | 0
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 51,148
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | 0 |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
FPB traditional and limited-payment contracts |  |  |  | 51,148 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 0 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | 0 |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | 0 |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 0 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 0 |
Participating Life Insurance Contract | MetLife Holdings | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 51,148
Long-Duration Insurance, Other |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 11,099 | 10,101 |  |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | (6,561)
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 12,567
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | (492) |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | (176) |
FPB traditional and limited-payment contracts |  |  |  | 14,031 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 56 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | (124) |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | (275) |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 2,475 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 275 |
Ceded Recoverables on traditional and limited-payment contracts |  |  |  | 1,391 |
Effect of remeasurement of the ceded recoverable to an upper-medium grade discount rate |  |  |  | 297 |
Adjustments for loss contracts (with net premiums in excess of gross premiums) under the modified retrospective approach |  |  |  | 32 |
Adjustments for the cumulative effect of adoption on ceded recoverables on traditional and limited-payment contract |  |  |  | 10 |
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance |  |  |  | 380 | 1,977
Ceded recoverables on additional insurance liabilities |  |  |  | 0 | 8
Ceded Recoverable Reclassification of carrying amount of contracts and contract features that are reinsured market risk benefits |  |  |  | (8) |
Ceded Recoverable Adjustments for the cumulative effect of adoption on ceded recoverables on additional insurance liabilities |  |  |  | 0 |
Additional Insurance Liabilities Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | (1,642) |
Additional Insurance Liabilities Adjustments for the cumulative effect of adoption on additional insurance liabilities |  |  |  | 45 |
Long-Duration Insurance, Other | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 19,128
Ceded Recoverables on traditional and limited-payment contracts |  |  |  |  | 1,052
Short-Duration Insurance, Other |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 13,190 | 13,164 |  |  |
Removal of additional insurance liabilities for separate presentation |  |  |  |  | 0
Subtotal - pre-adoption balance, excluding additional liabilities |  |  |  |  | 13,356
FPB Removal of related amounts in accumulated other comprehensive income |  |  |  | 0 |
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
FPB traditional and limited-payment contracts |  |  |  | 13,356 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  | 0 |
Other balance sheet reclassifications and adjustments upon adoption of the LDTI standard |  |  |  | 0 |
Removal of remeasured deferred profit liabilities for separate presentation |  |  |  | 0 |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  | 0 |
Balance, deferred profit liabilities at January 1, 2021 |  |  |  | 0 |
Short-Duration Insurance, Other | Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits |  |  |  |  | 13,356
Variable Life | Asia |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 1,258 | 1,381 |  |  |
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance | 1,258 | 1,381 | 1,595 | 1,824 | 1,824
Ceded recoverables on additional insurance liabilities |  |  |  | 0 | 0
Ceded Recoverable Reclassification of carrying amount of contracts and contract features that are reinsured market risk benefits |  |  |  | 0 |
Ceded Recoverable Adjustments for the cumulative effect of adoption on ceded recoverables on additional insurance liabilities |  |  |  | 0 |
Additional Insurance Liabilities Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
Additional Insurance Liabilities Adjustments for the cumulative effect of adoption on additional insurance liabilities |  |  |  | 0 |
Universal and Variable Universal Life | Asia |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 424 | 455 |  |  |
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance | 424 | 455 | 655 | 788 | 788
Ceded recoverables on additional insurance liabilities |  |  |  | 0 | 0
Ceded Recoverable Reclassification of carrying amount of contracts and contract features that are reinsured market risk benefits |  |  |  | 0 |
Ceded Recoverable Adjustments for the cumulative effect of adoption on ceded recoverables on additional insurance liabilities |  |  |  | 0 |
Additional Insurance Liabilities Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
Additional Insurance Liabilities Adjustments for the cumulative effect of adoption on additional insurance liabilities |  |  |  | 0 |
Universal and Variable Universal Life | MetLife Holdings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net liability for future policy benefits | 2,362 | 2,156 |  |  |
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance | $ 2,362 | $ 2,156 | $ 2,117 | 2,014 | 1,976
Ceded recoverables on additional insurance liabilities |  |  |  | 720 | $ 719
Ceded Recoverable Reclassification of carrying amount of contracts and contract features that are reinsured market risk benefits |  |  |  | 0 |
Ceded Recoverable Adjustments for the cumulative effect of adoption on ceded recoverables on additional insurance liabilities |  |  |  | 1 |
Additional Insurance Liabilities Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  | 0 |
Additional Insurance Liabilities Adjustments for the cumulative effect of adoption on additional insurance liabilities |  |  |  | $ 38 |

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- Definition Amount, before effect of reinsurance and current period update of cash flow assumption, of present value of total expected payment to policyholder in excess of present value of total expected assessment, discounted at original rate. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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