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Commitments, Guarantees and Contingent Liabilities - Other Narrative (Details) $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 30, 2018 plaintiff judgment | Dec. 31, 2017 plaintiff | Jul. 06, 2016 plaintiff | May 20, 2016 plaintiff | Jan. 01, 2015 plaintiff | Jun. 30, 2017 plaintiff trial | Dec. 31, 2016 plaintiff | Jun. 30, 2015 plaintiff | Dec. 31, 2017 USD ($) | Dec. 31, 2001 employee case | Apr. 08, 2016 adjuster
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, new claims filed | case |  |  |  |  |  |  |  |  |  | 2 |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  |  | 118 | 498 | 460 |  | 118 | 10 |  | 32 |
Loss contingency, number of trials | trial |  |  |  |  |  | 2 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $ |  |  |  |  |  |  |  |  | $ 0 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $ |  |  |  |  |  |  |  |  | $ 240 |  |
Pending Litigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  | 410 |  |  |  | 8 |  |  |  |  |
Judicial Ruling |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  |  |  |  |  | 1 |  |  |  |  |
Fair Labor Standards Act |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Number of cases pending (in adjusters, in claims) | adjuster |  |  |  |  |  |  |  |  |  |  | 105
New York Labor Law |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Number of cases pending (in adjusters, in claims) | adjuster |  |  |  |  |  |  |  |  |  |  | 137
Signed Releases Knowingly and Voluntarily |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  |  |  |  |  |  |  | 2 |  |  |
Did Not Sign Releases Knowingly and Voluntarily |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  |  |  |  |  |  |  | 8 |  |  |
Plaintiffs Asserted Suffered Loss |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  |  |  |  |  |  | 2 |  |  |  |
Phase III | Pending Litigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  | 8 |  |  |  |  |  |  |  |  |
Individual Plaintiffs | Settled Litigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  | 4 |  |  |  |  |  |  |  |  |
Individual Plaintiffs | Pending Litigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) |  | 85 |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of summary judgments | judgment | 2 |  |  |  |  |  |  |  |  |  |
Subsequent Event | Judicial Ruling |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of plaintiffs (in plaintiffs, in cases) | 27 |  |  |  |  |  |  |  |  |  |

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