Settlement Assets and Obligations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Settlement assets:
Cash and cash equivalents	$ 1,426,000,000	$ 1,419,000,000
Investment securities	1,000,000	17,000,000
Due from card associations and bank partners	5,816,000,000	5,220,000,000
Due from merchants	907,000,000	899,000,000
Settlement assets	8,150,000,000	7,555,000,000
Long-term settlement assets:
Investment securities	1,000,000	3,000,000
Long-term settlement assets	8,151,000,000	7,558,000,000
Settlement obligations:
Payment instruments outstanding	34,000,000	82,000,000
Card settlements due to merchants	8,116,000,000	7,475,000,000
Settlement obligations	8,150,000,000	$ 7,557,000,000
Other disclosures
Net changes in settlement assets and obligations	$ 0