Revenue Recognition - Impacts of ASC 606 Adoption on Consolidated Statement of Income (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Processing and services									$ 4,975	$ 4,833	$ 4,625
Product									848	863	880
Total revenue	$ 1,551	$ 1,412	$ 1,420	$ 1,440	$ 1,516	$ 1,400	$ 1,386	$ 1,394	5,823	5,696	5,505
Expenses:
Cost of processing and services	628	568	560	568	576	572	573	570	2,324	2,291	2,212
Cost of product	194	181	179	191	202	174	175	182	745	733	747
Selling, general and administrative	298	305	320	305	313	284	276	277	1,228	1,150	1,101
(Gain) loss on sale of business	0	2	3	(232)	0	0	(10)	0	(227)	(10)	0
Total expenses	1,120	1,056	1,062	832	1,091	1,030	1,014	1,029	4,070	4,164	4,060
Operating income	431	356	358	608	425	370	372	365	1,753	1,532	1,445
Interest expense									(193)	(176)	(163)
Loss on early debt extinguishment									(14)	0	0
Non-operating income									9
Income from continuing operations before income taxes and income from investments in unconsolidated affiliates									1,555	1,358	1,275
Income tax provision									(378)	(158)	(492)
Income from investments in unconsolidated affiliates									10	32	147
Net income	$ 286	$ 227	$ 251	$ 423	$ 546	$ 232	$ 221	$ 247	$ 1,187	$ 1,246	$ 930
Net income per share – basic (in dollars per share)									$ 2.93	$ 2.95	$ 2.11
Net income per share – diluted (in dollars per share)									$ 2.87	$ 2.89	$ 2.08
Shares used in computing net income per share:
Basic (in shares)									405.5	422.3	440.6
Diluted (in shares)									413.7	431.3	447.8
Adjustments | Accounting Standards Update 2014-09
Revenue:
Processing and services									$ (26)
Product									(24)
Total revenue									(50)
Expenses:
Cost of processing and services									3
Cost of product									(2)
Selling, general and administrative									16
(Gain) loss on sale of business									(3)
Total expenses									14
Operating income									(64)
Interest expense									0
Loss on early debt extinguishment									0
Non-operating income									(1)
Income from continuing operations before income taxes and income from investments in unconsolidated affiliates									(65)
Income tax provision									14
Income from investments in unconsolidated affiliates									0
Net income									$ (51)
Net income per share – basic (in dollars per share)									$ (0.13)
Net income per share – diluted (in dollars per share)									$ (0.12)
Shares used in computing net income per share:
Basic (in shares)									0.0
Diluted (in shares)									0.0
Balances without adoption of ASC 606
Revenue:
Processing and services									$ 4,949
Product									824
Total revenue									5,773
Expenses:
Cost of processing and services									2,327
Cost of product									743
Selling, general and administrative									1,244
(Gain) loss on sale of business									(230)
Total expenses									4,084
Operating income									1,689
Interest expense									(193)
Loss on early debt extinguishment									(14)
Non-operating income									8
Income from continuing operations before income taxes and income from investments in unconsolidated affiliates									1,490
Income tax provision									(364)
Income from investments in unconsolidated affiliates									10
Net income									$ 1,136
Net income per share – basic (in dollars per share)									$ 2.80
Net income per share – diluted (in dollars per share)									$ 2.75
Shares used in computing net income per share:
Basic (in shares)									405.5
Diluted (in shares)									413.7