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Financing Receivables - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Rollforward of allowance for credit losses |  |  |  |
Beginning balance | $ 68 | $ 51 | [1] |
Provisions | (13) | 19 |  |
Charge-offs | (7) | (4) |  |
Recoveries | 1 |  |  |
Other | 2 |  |  |
Ending balance | 51 | 71 |  |
Commercial Loans |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance | 66 | 51 | [1] |
Provisions | (14) | 16 |  |
Charge-offs | (6) | (2) |  |
Other | 2 |  |  |
Ending balance | 48 | 67 |  |
Financing receivables |  |  |  |
Accrued interest on loans | 13 |  |  | $ 16
Consumer Loans |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance | 2 | 0 | [1] |
Provisions | 1 | 3 |  |
Charge-offs | (1) | (2) |  |
Recoveries | 1 |  |  |
Ending balance | $ 3 | 4 |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance |  | 5 |  |
Cumulative Effect, Period of Adoption, Adjustment | Commercial Loans |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance |  | 2 |  |
Cumulative Effect, Period of Adoption, Adjustment | Consumer Loans |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance |  | 3 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance |  | 56 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial Loans |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance |  | 53 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer Loans |  |  |  |
Rollforward of allowance for credit losses |  |  |  |
Beginning balance |  | $ 3 |  |
[1] | Prior to January 1, 2020, the allowance for credit losses was based on an incurred loss model that did not require estimating expected credit losses over the expected life of the asset.

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- Definition Amount, before allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: 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 + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + References Reference 1: 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 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on financing receivable, from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919246-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919204-210446 + Details
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