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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, Group (Details) - Group Benefits claim in Millions, $ in Millions	Dec. 31, 2023 USD ($) claim	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	$ 20,787
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	14,121
Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	14,262
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	8,187
Group life and accident, excluding premium waiver
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	6,525
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	5,934
2014 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,382	$ 1,382	$ 1,389	$ 1,395	$ 1,408	$ 1,431	$ 1,431	$ 1,430	$ 1,473	$ 1,636
IBNR Reserves	$ 0
Claims Reported | claim	31,783
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,164	1,122	1,079	1,025	960	884	801	675	448	$ 103
2015 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,380	1,380	1,380	1,385	1,401	1,420	1,422	1,442	1,595
IBNR Reserves	$ 0
Claims Reported | claim	32,750
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,125	1,078	1,025	962	891	806	687	460	$ 108
2016 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,400	1,401	1,409	1,417	1,437	1,468	1,481	1,651
IBNR Reserves	$ 0
Claims Reported | claim	33,296
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,100	1,043	981	907	819	705	479	$ 112
2017 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,289	1,296	1,304	1,316	1,358	1,413	1,597
IBNR Reserves	$ 0
Claims Reported | claim	30,923
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 970	911	842	757	658	452	$ 109
2018 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,271	1,276	1,277	1,309	1,387	1,647
IBNR Reserves	$ 0
Claims Reported | claim	28,426
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 897	827	743	639	447	$ 105
2019 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,287	1,284	1,327	1,424	1,650
IBNR Reserves	$ 1
Claims Reported | claim	27,458
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 832	751	650	454	$ 101
2020 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,282	1,323	1,407	1,686
IBNR Reserves	$ 1
Claims Reported | claim	25,848
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 767	663	458	$ 100
Short-Duration Insurance Contract, Accident Year 2021 [Member] | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,417	1,521	1,768
IBNR Reserves	$ 5
Claims Reported | claim	27,071
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 720	493	101
Short-Duration Insurance Contract, Accident Year 2021 [Member] | Group life and accident, excluding premium waiver
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	2,364	2,365	2,384
IBNR Reserves	$ 14
Claims Reported | claim	69,915
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 2,344	2,320	$ 1,764
Short-Duration Insurance Contract, Accident Year 2022 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,566	1,842
IBNR Reserves	$ 35
Claims Reported | claim	25,580
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 496	101
Short-Duration Insurance Contract, Accident Year 2022 | Group life and accident, excluding premium waiver
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	2,053	2,061
IBNR Reserves	$ 26
Claims Reported | claim	71,604
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 2,018	$ 1,562
Short-Duration Insurance Contract, Accident Year 2023 | Group long-term disability
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	1,988
IBNR Reserves	$ 1,009
Claims Reported | claim	17,404
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 116
Short-Duration Insurance Contract, Accident Year 2023 | Group life and accident, excluding premium waiver
Claims Development [Line Items]
Cumulative Incurred for Accident Years Displayed in Triangles	2,108
IBNR Reserves	$ 407
Claims Reported | claim	57,414
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 1,572

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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Cumulative number of reported claims for short-duration insurance contracts.

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