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Commitments and Contingencies Ignition Switch Recall (Details) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 jurisdiction | Dec. 31, 2018 USD ($) action state employee shares | Dec. 31, 2012 employee | Jan. 25, 2019 USD ($) | Dec. 31, 2017 USD ($) | Aug. 31, 2017 state
Ignition Switch Recall Litigations - July 2009 Sale Order [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of states | state |  |  |  |  |  | 16
Ignition Switch Recall Litigations - Lost Personal Time and Unjust Enrichment Claims [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of jurisdictions | jurisdiction | 47 |  |  |  |  |
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 |  |  |  |
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 |  | $ 590,000,000 |  |  |  |
Korea Wage Litigation - Salaried [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Reasonably possible loss |  | 170,000,000 |  |  |  |
Korea Wage Litigation - Former Subcontract Workers [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Reasonably possible loss |  | $ 150,000,000 |  |  |  |
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 |  | $ 1,300,000,000 |  |  |  |
Subsequent Event [Member] | Ignition Switch Recall Litigations - Contingently Issuable Shares [Member] | Amended and Restated Master Sale and Purchase Agreement [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Value of contingently issuable shares |  |  |  | $ 1,200,000,000 |  |
Granted Motion to Dismiss [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of states | state |  |  |  |  |  | 7
Granted Motion to Dismiss [Member] | Ignition Switch Recall Litigations - Lost Personal Time and Unjust Enrichment Claims [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of jurisdictions | jurisdiction | 41 |  |  |  |  |
Pending Litigation [Member] | Ignition Switch Recall Litigations - Economic Damage [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of jurisdictions | jurisdiction | 27 |  |  |  |  |
Pending Litigation [Member] | Ignition Switch Recall Litigations - July 2009 Sale Order [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of states | state |  | 8 |  |  |  | 9
Accrued liabilities and Other liabilities [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation-related liability and tax administrative matters |  | $ 1,300,000,000 |  |  | $ 930,000,000 |

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