Loan Receivables (Schedule of Credit Risk Profile by FICO Score and Origination Year) (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables		$ 88,927	$ 95,894
Credit Card Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables	[1],[2]	70,201	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]	$ 56,772	$ 61,997
FICO distribution %, credit card	[3]	81.00%	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]	$ 13,429	$ 15,184
FICO distribution %, credit card	[3]	19.00%	20.00%
Total Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables	[4]	$ 18,726	$ 18,713
Total Other Loans [Member] | Private Student Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loan receivables	[4],[5]	9,730	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]	$ 321
FICO distribution %, originated in 2020	[6],[7]	98.00%
Loan receivables, originated in 2019	[6],[7]	$ 1,714	$ 1,176
FICO distribution %, originated in 2019	[6],[7]	96.00%	93.00%
Loan receivables, originated in 2018	[6],[7]	$ 1,437	$ 1,518
FICO distribution %, originated in 2018	[6],[7]	95.00%	95.00%
Loan receivables, originated in 2017	[6],[7]	$ 1,114	$ 1,198
FICO distribution %, originated in 2017	[6],[7]	94.00%	95.00%
Loan receivables, originated in 2016	[6],[7]	$ 850	$ 934
FICO distribution %, originated in 2016	[6],[7]	94.00%	94.00%
Loan receivables, originated prior to 2016	[6],[7]	$ 3,749	$ 4,229
FICO distribution %, originated prior to 2016	[6],[7]	93.00%	93.00%
Loan receivables	[6],[7]	$ 9,185	$ 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]	$ 8
FICO distribution %, originated in 2020	[6],[7]	2.00%
Loan receivables, originated in 2019	[6],[7]	$ 72	$ 92
FICO distribution %, originated in 2019	[6],[7]	4.00%	7.00%
Loan receivables, originated in 2018	[6],[7]	$ 72	$ 79
FICO distribution %, originated in 2018	[6],[7]	5.00%	5.00%
Loan receivables, originated in 2017	[6],[7]	$ 67	$ 69
FICO distribution %, originated in 2017	[6],[7]	6.00%	5.00%
Loan receivables, originated in 2016	[6],[7]	$ 57	$ 58
FICO distribution %, originated in 2016	[6],[7]	6.00%	6.00%
Loan receivables, originated prior to 2016	[6],[7]	$ 269	$ 300
FICO distribution %, originated prior to 2016	[6],[7]	7.00%	7.00%
Loan receivables	[6],[7]	$ 545	$ 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]	$ 7,316	$ 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		$ 1,454
FICO distribution %, originated in 2020		99.00%
Loan receivables, originated in 2019		$ 2,840	$ 3,529
FICO distribution %, originated in 2019		97.00%	98.00%
Loan receivables, originated in 2018		$ 1,440	$ 1,941
FICO distribution %, originated in 2018		92.00%	93.00%
Loan receivables, originated in 2017		$ 821	$ 1,167
FICO distribution %, originated in 2017		89.00%	90.00%
Loan receivables, originated in 2016		$ 307	$ 475
FICO distribution %, originated in 2016		88.00%	88.00%
Loan receivables, originated prior to 2016		$ 77	$ 145
FICO distribution %, originated prior to 2016		83.00%	84.00%
Loan receivables		$ 6,939	$ 7,257
FICO distribution %, loan receivables		95.00%	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		$ 9
FICO distribution %, originated in 2020		1.00%
Loan receivables, originated in 2019		$ 91	$ 62
FICO distribution %, originated in 2019		3.00%	2.00%
Loan receivables, originated in 2018		$ 120	$ 140
FICO distribution %, originated in 2018		8.00%	7.00%
Loan receivables, originated in 2017		$ 98	$ 136
FICO distribution %, originated in 2017		11.00%	10.00%
Loan receivables, originated in 2016		$ 43	$ 65
FICO distribution %, originated in 2016		12.00%	12.00%
Loan receivables, originated prior to 2016		$ 16	$ 27
FICO distribution %, originated prior to 2016		17.00%	16.00%
Loan receivables		$ 377	$ 430
FICO distribution %, loan receivables		5.00%	6.00%

[1] Amounts include carrying values of $16.6 billion and $18.9 billion underlying investors' interest in trust debt at June 30, 2020 and December 31, 2019, respectively, and $11.0 billion and $12.7 billion in seller's interest at June 30, 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 $379 million and $471 million at June 30, 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 June 30, 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 $494 million, $48 million and $6 million, respectively, at June 30, 2020 and $461 million, $53 million and $4 million, respectively, at December 31, 2019.

[5] Amounts include carrying values of $274 million and $292 million in loans pledged as collateral against the note issued from a student loan securitization trust at June 30, 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.