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Business Developments (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Oct. 11, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Asset Acquisition
Allowance build (release) on acquisition (sale)		$ (68)
Exit Activities
Credit card receivables sold		900
Net transfers from loans held for investment to loans held for sale		100	$ 1,589	$ 855	$ 674
Gains on sales of partnership portfolios		$ 49
Restructuring Charges
Restructuring charges			28	$ 34
Walmart
Asset Acquisition
Total cash consideration for acquisition	$ 8,200
Assets recognized on acquisition	8,200
Allowance build (release) on acquisition (sale)	84
Launch and integration expenses			$ 211
Walmart | Credit Card
Asset Acquisition
Assets recognized on acquisition	8,100
Walmart | Accrued Interest
Asset Acquisition
Assets recognized on acquisition	$ 81

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Amounts receivable from issuing a card to individuals or businesses that allows someone to make a purchase on borrowed money.

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