Insurance (Reconciliation of Disclosure to Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	$ 14,125
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	958
Total unpaid claims and allocated claims adjustment expense	15,083
Unallocated claims adjustment expenses	3
Discounting	(1,326)
Liability for unpaid claims and claim adjustment liabilities - short-duration	13,760
Liability for unpaid claims and claim adjustment liabilities - long-duration	6,653
Liability for Claims and Claims Adjustment Expense	20,413	$ 20,013	$ 18,591	$ 19,216
UNITED STATES
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	10,686
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	213
Latin America
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	544
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	29
Group Life - Term
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	3,141
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	8
Group Life - Term | Asia
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	957
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	427
Group Long-Term Disability
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	7,545
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	205
Discounting	(1,200)	$ (1,100)
Protection Life
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	405
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	11
Protection Health
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	139
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	18
Other insurance lines - all segments combined
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net	1,938
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	$ 289