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Held-for-Sale Operations and Changes in Investments in Affiliates Mobility Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 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   $ 1,200
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