Statutory Information and Restrictions - Net Gain (Loss) from Operations, Net Income (Loss), Dividends to LNC Holding Company (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Insurance [Abstract]
U.S. net gain (loss) from operations, after-tax	$ (3,177)	$ (2,484)	$ 1,730
U.S. net income (loss)	(2,268)	(2,916)	1,991
U.S. cash dividends to LNC holding company	$ 491	$ 510	$ 667