Income Taxes (Tables)

9 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Factors Causing Variation in Effective Tax Rate From US Federal Statutory Rate

The differences that caused our effective income tax rates to differ from the 35% U.S. federal statutory rate for income taxes were as follows:

	Nine Months Ended December 31,
	2016			2015
	(in millions)
Income tax benefit at the federal statutory rate	$	223		$	460
Effect of:
State income taxes, net of federal income tax effect	8			33
State law changes, net of federal income tax effect	3			23
Increase deferred tax liability on FCC licenses	(46		)	—
Tax benefit from organizational restructuring	42			—
Change in federal and state valuation allowance	(522		)	(647		)
Other, net	6			5
Income tax expense	$	(286	)	$	(126	)
Effective income tax rate	(44.9		)%	(9.6		)%