Recent Accounting Pronouncements - Schedule of the Impact of Adoption on Statements of Operations and Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Apr. 01, 2018	Mar. 31, 2018
Assets
Receivables, net of allowance for doubtful accounts	$ 487		$ 354
Deferred contract costs	40		21
Other assets	191		21
Liabilities and Stockholders’ Equity
Accrued expenses and other current liabilities	356		180
Deferred revenue and advance contract payments	28	$ 27	53
Non-current deferred tax liabilities	111		176
Other long-term liabilities	212		25
Total stockholders’ equity	2,197		$ 2,729
Balances Without Adoption of ASC 606
Assets
Receivables, net of allowance for doubtful accounts	524
Deferred contract costs	37
Other assets	185
Liabilities and Stockholders’ Equity
Accrued expenses and other current liabilities	350
Deferred revenue and advance contract payments	62
Non-current deferred tax liabilities	109
Other long-term liabilities	221
Total stockholders’ equity	2,190
ASU 2014-09 | Effect of Change Higher/(Lower)
Assets
Receivables, net of allowance for doubtful accounts	(37)
Deferred contract costs	3
Other assets	6
Liabilities and Stockholders’ Equity
Accrued expenses and other current liabilities	6
Deferred revenue and advance contract payments	(34)
Non-current deferred tax liabilities	2
Other long-term liabilities	(9)
Total stockholders’ equity	$ 7