Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	$ 108,467	$ 113,007
U.S. Government agencies and authorities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	862	909
Corporate and foreign debt securities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	2,729	2,635
Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	3,015	2,928
Equity securities (including mutual funds)
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	100,890	105,331
Cash, cash equivalents and short-term investments
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	572	734
Receivable for securities and accruals
Fair Value, Separate Account Investment [Line Items]
Assets held in separate accounts	$ 399	$ 470

Amount of asset at fair value held for benefit of separate account policyholder.

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-Topic 944
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant