2014 Acquisitions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jan. 10, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 2,733	$ 2,760		$ 1,534
Digital Insight [Member]
Business Acquisition [Line Items]
Business Acquisitions, Pro Forma Expenses, Transactions Costs		6
Tangible assets acquired	73
Acquired intangible assets other than goodwill	559
Goodwill	1,243
Deferred tax liabilities	(190)
Liabilities assumed	(37)
Total purchase consideration	1,648		$ 1,648
Transaction expenses related to acquisition	15
Identifiable intangible assets acquired - Estimated Fair Value	$ 559
Identifiable intangible assets acquired - Weighted Average Amortization Period	13 years
Business Combination, Amount Withheld For Recovery of Possible Future Claims	$ 5
Digital Insight [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired - Estimated Fair Value	$ 336
Identifiable intangible assets acquired - Weighted Average Amortization Period	18 years
Digital Insight [Member] | Technology Software [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired - Estimated Fair Value	$ 121
Identifiable intangible assets acquired - Weighted Average Amortization Period	5 years
Digital Insight [Member] | Customer Contracts [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired - Estimated Fair Value	$ 89
Identifiable intangible assets acquired - Weighted Average Amortization Period	8 years
Digital Insight [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired - Estimated Fair Value	$ 13
Identifiable intangible assets acquired - Weighted Average Amortization Period	7 years
Digital Insight [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Transaction expenses related to acquisition	$ 8	$ 7