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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Workers’ compensation |  |
Product Information [Line Items] |  |
Prior accident year development | $ (20) | $ (25)
Workers’ compensation discount accretion |  |
Product Information [Line Items] |  |
Prior accident year development | 8 | 10
General liability |  |
Product Information [Line Items] |  |
Prior accident year development | 6 | 8
Package business |  |
Product Information [Line Items] |  |
Prior accident year development | 5 | 8
Professional liability |  |
Product Information [Line Items] |  |
Prior accident year development | 0 | 2
Bond |  |
Product Information [Line Items] |  |
Prior accident year development | 0 | 0
Net asbestos reserves |  |
Product Information [Line Items] |  |
Prior accident year development | 0 | 0
Net environmental reserves |  |
Product Information [Line Items] |  |
Prior accident year development | 0 | 0
Catastrophes |  |
Product Information [Line Items] |  |
Prior accident year development | (8) | (3)
Uncollectible reinsurance |  |
Product Information [Line Items] |  |
Prior accident year development | 0 | 0
Other reserve re-estimates, net |  |
Product Information [Line Items] |  |
Prior accident year development | 4 | (2)
Property and Casualty, Commercial Insurance Product Line [Member] | Property |  |
Product Information [Line Items] |  |
Prior accident year development | (2) | (13)
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile |  |
Product Information [Line Items] |  |
Prior accident year development | 0 | (5)
Property and Casualty, Personal Insurance Product Line [Member] | Property |  |
Product Information [Line Items] |  |
Prior accident year development | 1 | (12)
Property and Casualty, Personal Insurance Product Line [Member] | Automobile |  |
Product Information [Line Items] |  |
Prior accident year development | $ (5) | $ 0

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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