Business Segments (Corporate Items) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expenses:
Total revenues	$ 6,226	$ 5,886	$ 5,625
Amortization expense of acquired intangible assets	153	170	103
Merger and strategic initiatives expense	82	87	33
Restructuring charges	15	31	48
Regulatory matters	33	64	24
Extinguishment of debt	16	33	36
Operating income (loss)	1,564	1,441	1,234
Corporate Items
Expenses:
Total revenues	11	39	43
Amortization expense of acquired intangible assets	153	170	103
Merger and strategic initiatives expense	82	87	33
Restructuring charges	15	31	48
Regulatory matters	1	33	(6)
Provision for notes receivable	0	0	6
Extinguishment of debt	16	33	36
Charitable donations	0	0	17
Expenses - divested/contributed businesses	5	16	24
Other	30	9	18
Total expenses	302	379	279
Operating income (loss)	$ (291)	$ (340)	$ (236)