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Commitments, Guarantees and Contingencies Loss Contingencies (Details 3) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
Insurance-related Assessments [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability | $ 12 |
Loss contingency for guaranty fund assessments premium tax asset offset | $ 10 | $ 11
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Minimum interest rate guarantees in fixed accounts | 1.00% |
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Minimum interest rate guarantees in fixed accounts | 5.00% |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of insurance-related assessment liability that is expected to be recovered through a premium tax offset based on current laws applied to in-force policies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392405&loc=d3e24119-109301 + Details
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- Definition The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392405&loc=d3e24119-109301 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99384745&loc=d3e23169-109297 + Details
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