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Financing Receivables (Allowance for Loan Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020 | Dec. 31, 2019
Commercial Loan [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 51 | [1] | $ 49 |  |
Provision for Loan, Lease, and Other Losses |  | $ 13 |  |  |  | 2 |  |
Write-offs |  | 1 | $ (1) |  |  |  |  |
Recoveries |  | 0 |  |  |  |  |  |
Ending balance |  | 65 | 50 | 65 |  | 50 |  |
Accrued interest |  | 13 |  | 13 |  |  |  | $ 14
Commercial Loan [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | $ 2 |
Consumer Loan [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
Beginning balance | [1] |  |  | 0 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 3 |  |  |  |  |  |
Write-offs |  | (2) |  |  |  |  |  |
Recoveries |  | 0 |  |  |  |  |  |
Ending balance |  | 4 |  | 4 |  |  |  |
Consumer Loan [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | 3 |
Total Segment [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
Beginning balance | [1] |  |  | 51 |  |  |  |
Provision for Loan, Lease, and Other Losses |  | 16 |  |  |  |  |  |
Write-offs |  | (3) |  |  |  |  |  |
Recoveries |  | 0 |  |  |  |  |  |
Ending balance |  | 69 |  | 69 |  |  |  |
Total Segment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | $ 5 |
Syndicated loans [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
Loans purchased |  | 13 | 41 | 69 |  | 74 |  |
Loans sold |  | 0 | $ 14 | 7 |  | $ 27 |  |
Residential Mortgage [Member] |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |
Loans purchased |  | $ 22 |  | $ 22 |  |  |  |
[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 of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&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 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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=119407570&loc=SL82919249-210447 Reference 4: 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=118936363&loc=SL6953423-111524 + Details
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