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Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	$ 111,950	$ 101,676
U.S. Government agencies and authorities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	991	913
Corporate and foreign debt securities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	2,572	2,493
Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	2,903	3,087
Equity securities (including mutual funds)
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	104,625	94,685
Cash, cash equivalents and short-term investments
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	651	437
Receivable for securities and accruals
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	$ 208	$ 61

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