Financing Receivables - Credit Quality Information - Credit Card Receivables (Details) - Consumer Loans - Credit card receivables - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing receivables - credit quality information
Percentage of receivables past due	1.00%	1.00%
Loans	$ 93	$ 96
FICO Score, Greater than 800
Financing receivables - credit quality information
Loans	27	28
FICO Score, 750-799
Financing receivables - credit quality information
Loans	23	23
FICO Score, 700-749
Financing receivables - credit quality information
Loans	24	25
FICO Score. 650 to 699
Financing receivables - credit quality information
Loans	14	15
FICO Score, Less than 650
Financing receivables - credit quality information
Loans	$ 5	$ 5

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant