Tower Obligations - Narrative (Details) $ in Millions			12 Months Ended
	Jan. 03, 2022 USD ($)	Apr. 01, 2020 USD ($) tower_site renewal_option	Dec. 31, 2012 USD ($) tower_site	Jun. 30, 2024 USD ($) tower_site
Sale Leaseback Transaction [Line Items]
Number of renewal options | renewal_option		0
Tower obligation payments, due next year				$ 407
Tower obligation payments, due within two and three years				778
Tower obligation payment, due within four and five years				822
Tower obligation payments due thereafter				$ 3,900
Tower Transaction
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)	12 years
Sale leaseback transaction, fixed-price purchase options			$ 2,000
Interest rate on tower obligations	11.60%
Tower Transaction | Tower
Sale Leaseback Transaction [Line Items]
Useful life (in years)				20 years
Tower Transaction | Minimum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)			23 years
Tower Transaction | Maximum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract (years)			37 years
CCI Tower Lease Arrangement | Crown Castle International Corp.
Sale Leaseback Transaction [Line Items]
Interest rate on tower obligations	5.30%
Crown Castle International Corp.
Sale Leaseback Transaction [Line Items]
Increase to deferred tax liabilities	$ 1,200
Managed sites | tower_site				900
Lease liability				$ 245
Crown Castle International Corp. | Tower Transaction
Sale Leaseback Transaction [Line Items]
Property subject to failed sale leaseback transaction, number of units | tower_site		6,400	6,200
Remaining term of lease		17 years
Fixed-price purchase option on leased or subleased sites		$ 2,300
Fixed-price purchase option on lease or subleased sites, exercisable period		1 year
Days prior to expiration of agreement		120 days