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Commitments and Contingencies Ignition Switch Recall (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2015 | Dec. 31, 2017 USD ($) state attorney_general action case employee shareholder shares | Dec. 31, 2016 USD ($) | Dec. 31, 2012 employee | Sep. 01, 2017 case | Aug. 31, 2017 state | Aug. 04, 2017 case
Ignition Switch Recall Litigations [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of state Attorney Generals | attorney_general |  |  | 49 |  |  |  |  |
Ignition Switch Recall Litigations - July 2009 Sale Order [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of states | state |  |  |  |  |  |  | 16 |
Ignition Switch Recall Litigations - Contingently Issuable Shares [Member] | Amended and Restated Master Sale and Purchase Agreement [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Allowed general unsecured claims amount |  |  | $ 35,000,000,000.0 |  |  |  |  |
Contingently issuable shares (in shares) | shares |  |  | 30,000,000 |  |  |  |  |
Amount of allowed general unsecured claims |  |  | $ 31,900,000,000 |  |  |  |  |
Ignition Switch Recall Litigations - Shareholder Class Action [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation settlement amount |  |  |  | $ 300,000,000 |  |  |  |
Number of shareholders who have filed an appeal | shareholder |  |  | 1 |  |  |  |  |
Ignition Switch Recall Litigations - Investigation by the Office [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Amount of damages paid | $ 900,000,000 |  |  |  |  |  |  |
Prosecution deferral period | 3 years |  |  |  |  |  |  |
Period after the expiration of the period of deferral | 30 days |  |  |  |  |  |  |
Prosecution potential extension of deferral period |  | 1 year |  |  |  |  |  |
Maximum deferral period |  | 4 years |  |  |  |  |  |
Monitor's authority period |  | 3 years |  |  |  |  |  |
Monitor's extension period |  | 1 year |  |  |  |  |  |
Korea Wage Litigation - Hourly [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of plaintiffs | employee |  |  | 10,000 |  |  |  |  |
Number of employees in the case | employee |  |  |  |  | 5 |  |  |
Reasonably possible loss |  |  | $ 592,000,000 |  |  |  |  |
Korea Wage Litigation - Salaried [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reasonably possible loss |  |  | $ 185,000,000 |  |  |  |  |
U.S. and Canada [Member] | Ignition Switch Recall Litigations - Economic Damage [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending claims | action |  |  | 100 |  |  |  |  |
Foreign Tax Authority [Member] | Brazil [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimated potential recovery from taxing authority |  |  | $ 1,400,000,000 |  |  |  |  |
Granted Motion to Dismiss [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of states | state |  |  |  |  |  |  | 7 |
Pending Litigation [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of states | state |  |  | 8 |  |  |  | 9 |
Consolidated Litigation [Member] | Wayne County, Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending claims | case |  |  | 2 |  |  |  |  |
Consolidated Litigation [Member] | Eastern District of Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending claims | case |  |  | 3 |  |  |  |  |
Consolidated Litigation with Denied Dismissal [Member] | Eastern District of Michigan [Member] | Ignition Switch Recall Litigations, Shareholder Derivative Action [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending claims | case |  |  |  |  |  |  |  | 2
Judicial Ruling [Member] | Korea Wage Litigation - Salaried, Case One [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of claims remanded | case |  |  |  |  |  | 1 |  |
Judicial Ruling [Member] | Korea Wage Litigation - Salaried, Case Two [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of claims remanded | case |  |  |  |  |  | 1 |  |
Accrued liabilities and Other liabilities [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation-related liability and tax administrative matters |  |  | $ 930,000,000 | $ 1,200,000,000 |  |  |  |

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