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Employee Benefit Plans (Pension and Post Retirement Asset Allocations in Accordance with Investment Guidelines) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Notional	$ 487,415	$ 460,804
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	12,649	12,519	$ 15,242
Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4,777	4,784
Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3,637	3,168
Pension Benefits | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9,356	8,956
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,186	1,191	1,621
Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	39	32
Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	8	11
Postretirement | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	87	93
Postretirement | Variable Life Insurance Policies at contract value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	937	909
Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	193	82
Level 1 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Level 1 | Pension Benefits | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	193	82
Level 1 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Level 1 | Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Level 1 | Postretirement | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	40	50
Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4,493	4,637
Level 2 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Level 2 | Pension Benefits | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4,493	4,637
Level 2 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	39	32
Level 2 | Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	8	11
Level 2 | Postretirement | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	47	43
Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	91	65
Level 3 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3,637	3,168
Level 3 | Pension Benefits | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4,670	4,237
Level 3 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Level 3 | Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Level 3 | Postretirement | Net assets in the fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Investment Measure at Net Asset Value as a practical expedient | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,249	2,020
Investment Measure at Net Asset Value as a practical expedient | Pension Benefits | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	626	822
Investment Measure at Net Asset Value as a practical expedient | Pension Benefits | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	118	125
Investment Measure at Net Asset Value as a practical expedient | Pension Benefits | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	63	235
Investment Measure at Net Asset Value as a practical expedient | Pension Benefits | Equity Securities | International
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	237	361
Investment Measure at Net Asset Value as a practical expedient | Postretirement
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	162	189
Investment Measure at Net Asset Value as a practical expedient | Postretirement | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	660	372
Investment Measure at Net Asset Value as a practical expedient | Postretirement | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	351	600
Investment Measure at Net Asset Value as a practical expedient | Postretirement | Equity Securities | International
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	88	126
U.S. Equities | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	30	24
U.S. Equities | Level 1 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Equities | Level 2 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	30	24
U.S. Equities | Level 3 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International Equities | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9	8
International Equities | Level 1 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
International Equities | Level 2 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9	8
International Equities | Level 3 | Postretirement | Equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other U.S. government securities | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	536	406
Other U.S. government securities | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other U.S. government securities | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	536	406
Other U.S. government securities | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. government securities (state & other) | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	365	376
U.S. government securities (state & other) | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. government securities (state & other) | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	365	376
U.S. government securities (state & other) | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. government securities | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	51	57
Non-U.S. government securities | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. government securities | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	51	57
Non-U.S. government securities | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Corporate bonds | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,489	2,619
Corporate bonds | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Corporate bonds | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,480	2,619
Corporate bonds | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9	0
Asset-backed | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	66	46
Asset-backed | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Asset-backed | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	66	46
Asset-backed | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Collateralized mortgage obligations | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	447	472
Collateralized mortgage obligations | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Collateralized mortgage obligations | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	447	472
Collateralized mortgage obligations | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Collateralized loan obligations | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	549	650
Collateralized loan obligations | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Collateralized loan obligations | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	549	650
Collateralized loan obligations | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Interest Rate Swaps | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Notional	1,227	1,373
Interest Rate Swaps | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5	11
Interest Rate Swaps | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Interest Rate Swaps | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5	11
Interest Rate Swaps | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Registered investment companies | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	110	65
Registered investment companies | Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	8	11
Registered investment companies | Postretirement | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	40	50
Registered investment companies | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	110	65
Registered investment companies | Level 1 | Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Registered investment companies | Level 1 | Postretirement | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	40	50
Registered investment companies | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Registered investment companies | Level 2 | Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	8	11
Registered investment companies | Level 2 | Postretirement | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Registered investment companies | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Registered investment companies | Level 3 | Postretirement | Defined Benefit Plan, Debt Security
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Registered investment companies | Level 3 | Postretirement | Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	139	82
Other | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	63	17
Other | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(6)	0
Other | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	82	65
Partnerships | Pension Benefits | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	942	1,004
Partnerships | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,142	1,713
Partnerships | Level 1 | Pension Benefits | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Partnerships | Level 1 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Partnerships | Level 2 | Pension Benefits | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Partnerships | Level 2 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Partnerships | Level 3 | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	942	1,004	998
Partnerships | Level 3 | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,142	1,713	1,800
Partnerships | Level 3 | Pension Benefits | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	942	1,004
Partnerships | Level 3 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,142	1,713
Hedge Fund | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,495	1,455
Hedge Fund | Level 1 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Hedge Fund | Level 2 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Hedge Fund | Level 3 | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,495	1,455	$ 1,304
Hedge Fund | Level 3 | Pension Benefits | Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,495	1,455
Pooled separate accounts | Investment Measure at Net Asset Value as a practical expedient | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,222	2,347
Common/collective trusts | Investment Measure at Net Asset Value as a practical expedient | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	958	1,131
Other countries | Investment Measure at Net Asset Value as a practical expedient | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	113	85
Other common stocks | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	20	0
Other common stocks | Level 1 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	20	0
Other common stocks | Level 2 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other common stocks | Level 3 | Pension Benefits | Fixed Maturities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Net assets at fair value | Postretirement
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 249	$ 282

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Section 55
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