Leases Lessee Operating Leases (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Expense	[1]	$ 708	$ 660	$ 646
Variable Lease, Cost	[2]	205	175	164
Lease, Cost	[3]	$ 913	$ 835	$ 810

[1] Represents the Company's operating lease expense related to its ROU assets for the years ended December 31, 2023, 2022 and 2021.

[2] Represents the Company's expense related to contingent payments for operating leases (such as payments based on revenues derived from the communications infrastructure located on the leased asset) for the years ended December 31, 2023, 2022 and 2021. Such contingencies are recognized as expense in the period they are resolved.

[3] Excludes those direct operating expenses accounted for pursuant to accounting guidance outside the scope of ASC 842.