Separate Accounts (Separate Account Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 189,036	$ 196,251
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Fair Value, Separate Account Investment [Line Items]
Separate account assets	4,924	4,753
Obligations of U.S. states and their political subdivisions
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,483	2,514
Foreign government bonds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	122	109
U.S. corporate securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	12,553	13,783
Foreign corporate securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	3,302	4,282
Asset-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	2,129	3,445
Mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	13,335	10,154
Equity
Fair Value, Separate Account Investment [Line Items]
Separate account assets	85,788	92,137
Fixed Income
Fair Value, Separate Account Investment [Line Items]
Separate account assets	29,998	30,602
Other
Fair Value, Separate Account Investment [Line Items]
Separate account assets	6,152	6,315
Equity securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	5,198	5,459
Commercial mortgage and other loans
Fair Value, Separate Account Investment [Line Items]
Separate account assets	52	53
Other invested assets
Fair Value, Separate Account Investment [Line Items]
Separate account assets	19,837	19,749
Short-term investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	1,011	1,276
Cash and cash equivalents
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 2,152	$ 1,620