Additional Financial Information (Cash and Cash Equivalents and Restricted Cash Balances) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents from continuing operations	$ 2,423	$ 19,223	$ 18,485	$ 7,924
Cash and cash equivalents from discontinued operations	0	1,946	2,785	1,816
Restricted cash in Prepaid and other current assets	1	3	2	9
Restricted cash in Other Assets	70	144	133	121
Cash and Cash Equivalents and Restricted Cash	$ 2,494	$ 21,316	$ 21,405	$ 9,870