Divestitures - Assets And Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018	May 31, 2018	Mar. 31, 2018
Assets:
Total current assets of discontinued operations	$ 0		$ 581
Total non-current assets of discontinued operations	0		3,363
Liabilities:
Total current liabilities of discontinued operations	0		789
Total long-term liabilities of discontinued operations	$ 0		456
USPS Separation | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Assets:
Cash and cash equivalents		$ 95
Receivables, net		458
Prepaid expenses		82
Other current assets		35
Total current assets of discontinued operations		670
Intangible assets, net		882
Goodwill		2,029
Property and equipment, net		294
Other assets		157
Total non-current assets of discontinued operations		3,362
Total assets		4,032
Liabilities:
Short-term debt and current maturities of long-term debt		161
Accounts payable		165
Accrued payroll and related costs		17
Accrued expenses and other current liabilities		358
Deferred revenue and advance contract payments		53
Income tax payable		18
Total current liabilities of discontinued operations		772
Long-term debt, net of current maturities		1,320
Non-current deferred revenue		5
Non-current income tax liabilities and deferred tax liabilities		196
Other long-term liabilities		71
Total long-term liabilities of discontinued operations		1,592
Total liabilities		$ 2,364
USPS Separation | Discontinued Operations - Held for sale
Assets:
Cash and cash equivalents			68
Receivables, net			432
Prepaid expenses			75
Other current assets			6
Total current assets of discontinued operations			581
Intangible assets, net			912
Goodwill			2,033
Property and equipment, net			283
Other assets			135
Total non-current assets of discontinued operations			3,363
Total assets			3,944
Liabilities:
Short-term debt and current maturities of long-term debt			155
Accounts payable			195
Accrued payroll and related costs			22
Accrued expenses and other current liabilities			346
Deferred revenue and advance contract payments			53
Income tax payable			18
Total current liabilities of discontinued operations			789
Long-term debt, net of current maturities			214
Non-current deferred revenue			7
Non-current income tax liabilities and deferred tax liabilities			163
Other long-term liabilities			72
Total long-term liabilities of discontinued operations			456
Total liabilities			$ 1,245