Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified		3 Months Ended	0 Months Ended
	Dec. 31, 2013	Sep. 30, 2014 Synchrony Financial	Aug. 05, 2014 Synchrony Financial IPO [Member]	Sep. 03, 2014 Synchrony Financial Over Allotment Option [Member]
Synchrony Financial Initial Public Offering
Sale of Stock, Number Of Shares Issued In Transaction			125,000,000	3,500,000
Sale of Stock, Price Per Share			$ 23
Sale of Stock, Consideration Received on Transaction		$ 2,842
Sale of Stock, Percentage of Ownership after Transaction		85.00%
Proceeds From Issuance Of Unsecured Debt		8,000
Unsecured Long-Term Debt, Noncurrent		3,593
Debt Conversion Original Debt Due Date Of Debt Year		2019
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	$ 1,224