Loan Receivables (Schedule of Credit Risk Profile by FICO Score and Origination Year) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables		$ 92,963	$ 95,894
Credit Card Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables	[1],[2]	73,811	77,181
Revolving line-of-credit arrangements that were converted to term loans as a result of a TDR program, ending balance		1,000	956
Credit Card Loans [Member] | FICO Score, 660 and Above [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables, credit card	[3]	$ 58,598	$ 61,997
FICO distribution %, credit card	[3]	79.00%	80.00%
Credit Card Loans [Member] | FICO Score, Less Than 660 Or No Score [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables, credit card	[3]	$ 15,213	$ 15,184
FICO distribution %, credit card	[3]	21.00%	20.00%
Total Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables	[4]	$ 19,152	$ 18,713
Total Other Loans [Member] | Private Student Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables	[4],[5]	9,957	9,653
Total Other Loans [Member] | Private Student Loans [Member] | FICO Score, 660 and Above [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables, originated in 2020	[6],[7]	$ 207
FICO distribution %, originated in 2020	[6],[7]	97.00%
Loan receivables, originated in 2019	[6],[7]	$ 1,690	$ 1,176
FICO distribution %, originated in 2019	[6],[7]	94.00%	93.00%
Loan receivables, originated in 2018	[6],[7]	$ 1,465	$ 1,518
FICO distribution %, originated in 2018	[6],[7]	95.00%	95.00%
Loan receivables, originated in 2017	[6],[7]	$ 1,144	$ 1,198
FICO distribution %, originated in 2017	[6],[7]	94.00%	95.00%
Loan receivables, originated in 2016	[6],[7]	$ 883	$ 934
FICO distribution %, originated in 2016	[6],[7]	94.00%	94.00%
Loan receivables, originated prior to 2016	[6],[7]	$ 3,955	$ 4,229
FICO distribution %, originated prior to 2016	[6],[7]	93.00%	93.00%
Loan receivables	[6],[7]	$ 9,344	$ 9,055
FICO distribution %, loan receivables	[6],[7]	94.00%	94.00%
Total Other Loans [Member] | Private Student Loans [Member] | FICO Score, Less Than 660 Or No Score [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables, originated in 2020	[6],[7]	$ 6
FICO distribution %, originated in 2020	[6],[7]	3.00%
Loan receivables, originated in 2019	[6],[7]	$ 112	$ 92
FICO distribution %, originated in 2019	[6],[7]	6.00%	7.00%
Loan receivables, originated in 2018	[6],[7]	$ 81	$ 79
FICO distribution %, originated in 2018	[6],[7]	5.00%	5.00%
Loan receivables, originated in 2017	[6],[7]	$ 70	$ 69
FICO distribution %, originated in 2017	[6],[7]	6.00%	5.00%
Loan receivables, originated in 2016	[6],[7]	$ 58	$ 58
FICO distribution %, originated in 2016	[6],[7]	6.00%	6.00%
Loan receivables, originated prior to 2016	[6],[7]	$ 286	$ 300
FICO distribution %, originated prior to 2016	[6],[7]	7.00%	7.00%
Loan receivables	[6],[7]	$ 613	$ 598
FICO distribution %, loan receivables	[6],[7]	6.00%	6.00%
Total Other Loans [Member] | Personal Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables	[4]	$ 7,651	$ 7,687
Total Other Loans [Member] | Personal Loans [Member] | FICO Score, 660 and Above [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables, originated in 2020		$ 923
FICO distribution %, originated in 2020		100.00%
Loan receivables, originated in 2019		$ 3,171	$ 3,529
FICO distribution %, originated in 2019		97.00%	98.00%
Loan receivables, originated in 2018		$ 1,666	$ 1,941
FICO distribution %, originated in 2018		92.00%	93.00%
Loan receivables, originated in 2017		$ 974	$ 1,167
FICO distribution %, originated in 2017		89.00%	90.00%
Loan receivables, originated in 2016		$ 380	$ 475
FICO distribution %, originated in 2016		87.00%	88.00%
Loan receivables, originated prior to 2016		$ 105	$ 145
FICO distribution %, originated prior to 2016		83.00%	84.00%
Loan receivables		$ 7,219	$ 7,257
FICO distribution %, loan receivables		94.00%	94.00%
Total Other Loans [Member] | Personal Loans [Member] | FICO Score, Less Than 660 Or No Score [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables, originated in 2020		$ 4
FICO distribution %, originated in 2020		0.00%
Loan receivables, originated in 2019		$ 90	$ 62
FICO distribution %, originated in 2019		3.00%	2.00%
Loan receivables, originated in 2018		$ 141	$ 140
FICO distribution %, originated in 2018		8.00%	7.00%
Loan receivables, originated in 2017		$ 120	$ 136
FICO distribution %, originated in 2017		11.00%	10.00%
Loan receivables, originated in 2016		$ 55	$ 65
FICO distribution %, originated in 2016		13.00%	12.00%
Loan receivables, originated prior to 2016		$ 22	$ 27
FICO distribution %, originated prior to 2016		17.00%	16.00%
Loan receivables		$ 432	$ 430
FICO distribution %, loan receivables		6.00%	6.00%

[1] Amounts include carrying values of $18.4 billion and $18.9 billion underlying investors' interest in trust debt at March 31, 2020 and December 31, 2019, respectively, and $10.8 billion and $12.7 billion in seller's interest at March 31, 2020 and December 31, 2019, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

[2] Unbilled accrued interest receivable on credit card loans, which is presented as part of other assets in the Company's condensed consolidated statements of financial condition, was $425 million and $471 million at March 31, 2020 and December 31, 2019, respectively.

[3] Amounts include $1.0 billion and $956 million of revolving line-of-credit arrangements that were converted to term loans as a result of a TDR program as of March 31, 2020 and December 31, 2019, respectively.

[4] Accrued interest receivable on private student, personal and other loans, which is presented as part of other assets in the Company's condensed consolidated statements of financial condition, was $495 million, $53 million and $5 million, respectively, at March 31, 2020 and $461 million, $53 million and $4 million, respectively, at December 31, 2019.

[5] Amounts include carrying values of $287 million and $292 million in loans pledged as collateral against the note issued from a student loan securitization trust at March 31, 2020 and December 31, 2019, respectively. See Note 4: Credit Card and Student Loan Securitization Activities for additional information.

[6] A majority of student loans originations occur in the third quarter and disbursements can span across multiple calendar years.

[7] FICO score represents the higher credit score of the cosigner or borrower.