Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment

The components of property and equipment were as follows:

(in millions)	Useful Lives	December 31, 2018			December 31, 2017
Buildings and equipment	Up to 40 years	$	2,423		$	2,066
Wireless communications systems	Up to 20 years	35,282			32,706
Leasehold improvements	Up to 12 years	1,299			1,182
Capitalized software	Up to 10 years	11,712			10,563
Leased devices	Up to 18 months	1,164			1,209
Construction in progress		2,776			1,771
Accumulated depreciation and amortization		(31,297		)	(27,301		)
Property and equipment, net		$	23,359		$	22,196

Schedule of Leased Wireless Devices

The components of leased wireless devices under our JUMP! On Demand program were as follows:

(in millions)	December 31, 2018			December 31, 2017
Leased wireless devices, gross	$	1,159		$	1,209
Accumulated depreciation	(622		)	(417		)
Leased wireless devices, net	$	537		$	792

Schedule of Future Minimum Rental Payments

Future minimum payments expected to be received over the lease term related to the leased wireless devices, which exclude optional residual buy-out amounts at the end of the lease term, are summarized below:

(in millions)	Total
Year Ended December 31,
2019	$	419
2020	59
Total	$	478

Schedule of Asset Retirement Obligations

Activity in our asset retirement obligations was as follows:

(in millions)	December 31, 2018			December 31, 2017
Asset retirement obligations, beginning of year	$	562		$	539
Liabilities incurred	26			25
Liabilities settled	(9		)	(16		)
Accretion expense	30			27
Changes in estimated cash flows	—			(13		)
Asset retirement obligations, end of year	$	609		$	562
Classified on the balance sheet as:
Other current liabilities	$	—		$	3
Other long-term liabilities	609			559
Asset retirement obligations	$	609		$	562