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New Accounting Pronouncements - Narrative (Detail) - USD ($)
$ in Millions
Jan. 01, 2019
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Insurance and Other [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Property, plant and equipment, net   $ 24,357   $ 20,104
Aircraft Sold Under Fractional Aircraft Ownership Programs [Member] | Insurance and Other [Member] | ASC 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Other liabilities     $ 3,500  
Aircraft Sold Under Fractional Aircraft Ownership Programs [Member] | Insurance and Other [Member] | Machinery and equipment [Member] | ASC 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Property, plant and equipment, net     $ 3,500  
Scenario, Forecast [Member] | ASU 2016-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating leases, right of use assets $ 6,000      
Operating lease liabilities $ 6,000