Revenue and Expenses, Operating Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Expenses [Line Items]
Operating losses	$ 329	$ 2,218	$ 828	$ 3,467
Legal actions [Member]
Schedule of Expenses [Line Items]
Operating losses	175	984	115	1,097
Customer remediation [Member]
Schedule of Expenses [Line Items]
Operating losses	(30)	978	133	1,615
Other operating loss [Member]
Schedule of Expenses [Line Items]
Operating losses	$ 184	$ 256	$ 580	$ 755