Nonoperating Income (Expense) (Schedule of Nonoperating Income (Expense)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income and Expenses [Abstract]
Other components of net periodic benefit costs	$ 7	$ 44	$ 44
Realized investment gains (losses)	89	123	120
Unrealized investment gains (losses)	(271)	(394)	281
Total investment gains (losses)	(182)	(271)	401
Gain on sale of product lines	0	0	5
Total other income (expense), net	$ (175)	$ (227)	$ 450