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Acquisitions and Divestitures - TracFone Wireless, Inc. (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Nov. 23, 2021	Nov. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Business acquisition, purchase price in cash			$ 30	$ (248)	$ 4,065
TracFone Wireless, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price in cash	$ 3,500
Number of shares issuable (in shares)	57,596,544	57,600,000
Common stock value consideration to acquire business	$ 3,000	$ 3,000
Future cash consideration related to achievement of certain performance measures	650
Contingent consideration	$ 560
Contingent consideration, earnout period	2 years
Contingent consideration payment			$ 257	188
Cash acquired				$ 248