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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Oct. 31, 2018
Income Tax Disclosure [Abstract]            
Income tax expense $ 100 $ 2,316 $ 1,085 $ 3,637    
Tax benefit from U.S. tax reform 157   157      
Tax expense, entities included in effective tax rate calculation   583   2,100    
Tax expense from change in deferred tax asset valuation allowance   $ 2,300   $ 2,300    
Net deferred tax assets $ 22,400   $ 22,400      
Operating Loss Carryforwards [Line Items]            
Tax expense related to tax reform legislation         $ 7,300  
Tax expense related to tax reform legislation, updated         $ 7,100  
Forecast [Member] | Germany [Member] | Foreign Tax Authority [Member]            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards           $ 3,300
Deferred tax assets           $ 1,000