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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended |
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Mar. 31, 2020 | Jan. 01, 2020
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | $ (48) |
Current period provision | (2) |
Ending allowance for uncollectible reinsurance | (52) |
Corporate Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | 0 |
Current period provision | (1) |
Ending allowance for uncollectible reinsurance | (2) |
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | (48) |
Current period provision | (1) |
Ending allowance for uncollectible reinsurance | (49) |
Operating Segments [Member] | Group Benefits [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | 0 |
Current period provision | 0 |
Ending allowance for uncollectible reinsurance | (1) |
Uncollectible reinsurance |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | (114) |
Ending allowance for uncollectible reinsurance | (117) |
Uncollectible reinsurance | Corporate Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | 0 |
Ending allowance for uncollectible reinsurance | (2) |
Uncollectible reinsurance | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | (114) |
Ending allowance for uncollectible reinsurance | (114) |
Uncollectible reinsurance | Operating Segments [Member] | Group Benefits [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | 0 |
Ending allowance for uncollectible reinsurance | (1) |
Disputes [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | (66) |
Ending allowance for uncollectible reinsurance | (65) |
Disputes [Member] | Corporate Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | 0 |
Ending allowance for uncollectible reinsurance | 0 |
Disputes [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | (66) |
Ending allowance for uncollectible reinsurance | (65) |
Disputes [Member] | Operating Segments [Member] | Group Benefits [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Beginning allowance for uncollectible reinsurance | 0 |
Ending allowance for uncollectible reinsurance | $ 0 |
Accounting Standards Update 2016-13 [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Cumulative effect of accounting change [1] |  | $ (2)
Accounting Standards Update 2016-13 [Member] | Corporate Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Cumulative effect of accounting change [1] |  | (1)
Accounting Standards Update 2016-13 [Member] | Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Cumulative effect of accounting change [1] |  | 0
Accounting Standards Update 2016-13 [Member] | Operating Segments [Member] | Group Benefits [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Cumulative effect of accounting change [1] |  | $ (1)

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- Definition Amount of increase (decrease) in allowance for credit loss on reinsurance recoverable. + 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=119407570&loc=SL82919249-210447 + Details
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