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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Workers’ compensation |  |
Product Information [Line Items] |  |
Prior accident year development | $ (97) | $ (29)
Workers’ compensation discount accretion |  |
Product Information [Line Items] |  |
Prior accident year development | 30 | 21
General liability |  |
Product Information [Line Items] |  |
Prior accident year development | 32 | 10
Package business |  |
Product Information [Line Items] |  |
Prior accident year development | (16) | (22)
Professional liability |  |
Product Information [Line Items] |  |
Prior accident year development | (12) | 0
Bond |  |
Product Information [Line Items] |  |
Prior accident year development | 0 | 10
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 | (47) | (12)
Uncollectible reinsurance |  |
Product Information [Line Items] |  |
Prior accident year development | 22 | 0
Other reserve re-estimates, net |  |
Product Information [Line Items] |  |
Prior accident year development | 4 | 8
Property and Casualty, Commercial Insurance Product Line [Member] | Property |  |
Product Information [Line Items] |  |
Prior accident year development | (10) | (5)
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile |  |
Product Information [Line Items] |  |
Prior accident year development | (15) | 20
Property and Casualty, Personal Insurance Product Line [Member] | Property |  |
Product Information [Line Items] |  |
Prior accident year development | (20) | 0
Property and Casualty, Personal Insurance Product Line [Member] | Automobile |  |
Product Information [Line Items] |  |
Prior accident year development | $ (10) | $ 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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