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Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	$ 99,147	$ 93,133
U.S. Government agencies and authorities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	831	1,015
Corporate and foreign debt securities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	2,728	2,528
Mortgage-backed securities | Mortgage-Backed Securities, Issued by Private Enterprises
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	3,073	3,231
Equity securities (including mutual funds)
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	92,004	85,916
Cash, cash equivalents and short-term investments
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	356	399
Receivable for securities and accruals
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	$ 155	$ 44

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