Loan Receivables (Schedule of Loan Receivables) (Details) - USD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | $ 128,409 | $ 112,120 | ||||||||||||
| Allowance for credit losses | (9,283) | (7,374) | $ (6,822) | $ (8,226) | ||||||||||
| Net loan receivables | 119,126 | 104,746 | ||||||||||||
| Variable Interest Entity, Primary Beneficiary [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | 30,590 | 25,937 | ||||||||||||
| Allowance for credit losses | (1,347) | (1,152) | ||||||||||||
| Credit Card Securitization Trusts [Member] | Variable Interest Entity, Primary Beneficiary [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | [1] | 30,440 | 25,761 | |||||||||||
| Allowance for credit losses | [1] | (1,347) | (1,152) | |||||||||||
| Net loan receivables | 29,093 | 24,609 | ||||||||||||
| Sellers' interest | 15,598 | 12,220 | ||||||||||||
| Credit Card Loans [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | [2],[3] | 102,259 | 90,113 | |||||||||||
| Allowance for credit losses | (7,619) | (5,883) | (5,273) | (6,491) | ||||||||||
| Interest Receivable | 753 | 611 | ||||||||||||
| Credit Card Loans [Member] | Credit Card Securitization Trusts [Member] | Variable Interest Entity, Primary Beneficiary [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Investors' interests | 14,800 | 13,500 | ||||||||||||
| Sellers' interest | 15,600 | 12,200 | ||||||||||||
| Total Other Loans [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | [4] | 26,150 | 22,007 | |||||||||||
| Total Other Loans [Member] | Private Student Loans [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | [4],[5] | 10,352 | 10,308 | |||||||||||
| Allowance for credit losses | (858) | (839) | (843) | (840) | ||||||||||
| Interest Receivable | 522 | 468 | ||||||||||||
| Private student loans including PCI in repayment | 6,300 | 6,000 | ||||||||||||
| Total Other Loans [Member] | Personal Loans [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | [4] | 9,852 | 7,998 | |||||||||||
| Allowance for credit losses | (722) | (595) | (662) | (857) | ||||||||||
| Interest Receivable | 69 | 49 | ||||||||||||
| Total Other Loans [Member] | Other Loans [Member] | ||||||||||||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||||||||||||
| Loan receivables | [4] | 5,946 | 3,701 | |||||||||||
| Allowance for credit losses | (84) | (57) | $ (44) | $ (38) | ||||||||||
| Interest Receivable | $ 21 | $ 11 | ||||||||||||
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