Nonoperating Income (Expense) (Schedule of Nonoperating Income (Expense)) (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Income and Expenses [Abstract]
Other components of net periodic benefit costs		$ 45	$ 42	$ 16
Realized investment gains (losses)		123	120	25
Unrealized investment gains (losses)		(394)	281	(7)
Total investment gains (losses)		(271)	401	18
Gains on sale of product lines	$ 455	0	13	455
Other		0	0	5
Other income (expense), net		$ (226)	$ 456	$ 494