Impact of Adopting Topic 606 2 (Details) - USD ($) $ in Millions	Jun. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 3,328		$ 3,405
Trade accounts receivable, net	525		793
Contract assets	797		0
Other current assets	112		210
Total current assets	4,762		4,408
Property and equipment, net	222		237
Goodwill	6,792		6,804
Capitalized software and other intangible assets, net	1,044		1,111
Deferred income taxes	121		346
Contract assets	117		0
Contract costs	408		0
Other noncurrent assets, net	128		154
Total assets	13,594		13,060
Current liabilities:
Current portion of long-term debt	270		269
Accounts payable	87		85
Accrued salaries, wages and commissions	201		242
Accrued expenses and other current liabilities	324		340
Deferred revenue and advanced payments	1,108		2,289
Taxes payable, other than income taxes payable	31		55
Federal, state and foreign income taxes payable	133		41
Total current liabilities	2,154		3,321
Long-term debt, net of current portion	2,510		2,514
Federal, state and foreign income taxes payable	309		311
Deferred income taxes	179		111
Deferred revenue and advanced payments	481		820
Other noncurrent liabilities	100		88
Total liabilities	5,733		7,165
Stockholders' equity:
Preferred stock	0		0
Common stock	59		59
Additional paid-in capital	3,699		3,744
Retained earnings	9,134		6,971
Accumulated other comprehensive loss	(440)		(290)
Treasury stock	(4,591)		(4,589)
Total stockholders' equity	7,861		5,895
Total liabilities and stockholders' equity	13,594		13,060
As Reported under Topic 606
Current assets:
Cash and cash equivalents	3,328	$ 3,405
Trade accounts receivable, net	525	802
Contract assets	797	772
Other current assets	112	172
Total current assets	4,762	5,151
Property and equipment, net	222	237
Goodwill	6,792	6,804
Capitalized software and other intangible assets, net	1,044	1,111
Deferred income taxes	121	125
Contract assets	117	159
Contract costs	408	427
Other noncurrent assets, net	128	135
Total assets	13,594	14,149
Current liabilities:
Current portion of long-term debt	270	269
Accounts payable	87	85
Accrued salaries, wages and commissions	201	242
Accrued expenses and other current liabilities	324	332
Deferred revenue and advanced payments	1,108	1,222
Taxes payable, other than income taxes payable	31	55
Federal, state and foreign income taxes payable	133	211
Total current liabilities	2,154	2,416
Long-term debt, net of current portion	2,510	2,514
Federal, state and foreign income taxes payable	309	421
Deferred income taxes	179	191
Deferred revenue and advanced payments	481	529
Other noncurrent liabilities	100	88
Total liabilities	5,733	6,159
Stockholders' equity:
Preferred stock	0	0
Common stock	59	59
Additional paid-in capital	3,699	3,744
Retained earnings	9,134	9,075
Accumulated other comprehensive loss	(440)	(299)
Treasury stock	(4,591)	(4,589)
Total stockholders' equity	7,861	7,990
Total liabilities and stockholders' equity	13,594	14,149
Proforma as if the previous accounting of Topic 605 was in effect
Current assets:
Cash and cash equivalents	3,328		3,405
Trade accounts receivable, net	523		793
Contract assets	0		0
Other current assets	164		210
Total current assets	4,015		4,408
Property and equipment, net	222		237
Goodwill	6,792		6,804
Capitalized software and other intangible assets, net	1,044		1,111
Deferred income taxes	336		346
Contract assets	0		0
Contract costs	0		0
Other noncurrent assets, net	145		154
Total assets	12,554		13,060
Current liabilities:
Current portion of long-term debt	270		269
Accounts payable	87		85
Accrued salaries, wages and commissions	201		242
Accrued expenses and other current liabilities	334		340
Deferred revenue and advanced payments	2,070		2,289
Taxes payable, other than income taxes payable	31		55
Federal, state and foreign income taxes payable	0		41
Total current liabilities	2,993		3,321
Long-term debt, net of current portion	2,510		2,514
Federal, state and foreign income taxes payable	199		311
Deferred income taxes	105		111
Deferred revenue and advanced payments	738		820
Other noncurrent liabilities	100		88
Total liabilities	6,645		7,165
Stockholders' equity:
Preferred stock	0		0
Common stock	59		59
Additional paid-in capital	3,699		3,744
Retained earnings	7,125		6,971
Accumulated other comprehensive loss	(383)		(290)
Treasury stock	(4,591)		(4,589)
Total stockholders' equity	5,909		5,895
Total liabilities and stockholders' equity	12,554		$ 13,060
Effect of Change Higher/(Lower)
Current assets:
Cash and cash equivalents	0	0
Trade accounts receivable, net	2	9
Contract assets	797	772
Other current assets	(52)	(38)
Total current assets	747	743
Property and equipment, net	0	0
Goodwill	0	0
Capitalized software and other intangible assets, net	0	0
Deferred income taxes	(215)	(221)
Contract assets	117	159
Contract costs	408	427
Other noncurrent assets, net	(17)	(19)
Total assets	1,040	1,089
Current liabilities:
Current portion of long-term debt	0	0
Accounts payable	0	0
Accrued salaries, wages and commissions	0	0
Accrued expenses and other current liabilities	(10)	(8)
Deferred revenue and advanced payments	(962)	(1,067)
Taxes payable, other than income taxes payable	0	0
Federal, state and foreign income taxes payable	133	170
Total current liabilities	(839)	(905)
Long-term debt, net of current portion	0	0
Federal, state and foreign income taxes payable	110	110
Deferred income taxes	74	80
Deferred revenue and advanced payments	(257)	(291)
Other noncurrent liabilities	0	0
Total liabilities	(912)	(1,006)
Stockholders' equity:
Preferred stock	0	0
Common stock	0	0
Additional paid-in capital	0	0
Retained earnings	2,009	2,104
Accumulated other comprehensive loss	(57)	(9)
Treasury stock	0	0
Total stockholders' equity	1,952	2,095
Total liabilities and stockholders' equity	$ 1,040	$ 1,089