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Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss    
Fixed maturity securities $ (7,054) $ (6,119)
Derivatives 401 351
Other (8) 2
Subtotal (6,661) (5,766)
Amounts allocated from: Future policy benefits 813 652
Deferred income tax benefit (expense) 1,228 1,074
Net unrealized investment gains (losses) $ (4,620) $ (4,040)