Changes in Restructuring Liability (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Balance, as of June 30, 2017	$ 432
Restructuring charges	0
Cash paid	(184)
Balance, as of September 30, 2017	248
Severance
Restructuring Cost and Reserve [Line Items]
Balance, as of June 30, 2017	373
Restructuring charges	0
Cash paid	(179)
Balance, as of September 30, 2017	194
Other
Restructuring Cost and Reserve [Line Items]
Balance, as of June 30, 2017	59	[1]
Restructuring charges	0	[1]
Cash paid	(5)	[1]
Balance, as of September 30, 2017	$ 54	[1]

[1] Primarily reflects activities associated with the consolidation of our phone facilities, manufacturing operations, and contract termination costs.