Held-for-Sale Operations and Changes in Investments in Affiliates Mobility Segment (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount	$ 1,700	$ 1,200
Operating Segments \| Mobility \| Argo AI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale of Interest by Parent	500
Future Funding Commitment	600
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	2,800
Operating Segments \| Mobility \| Argo AI [Member] \| Other Income [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	3,500
Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount	2,900
Operating Segments \| Mobility \| Argo AI [Member] \| Equity in net assets of affiliated companies [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investments, Fair Value Disclosure	2,400
Operating Segments \| Mobility \| Argo AI [Member] \| Other Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount	$ 400

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Represents a sale by the parent of a portion of its equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The sale of the equity interest represented by this element does not result in a loss of control by the parent.

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Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

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Fair value portion of investments accounted under the equity method.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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