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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jul. 25, 2018
Income Tax Disclosure [Abstract]            
Income tax expense $ 519 $ 534 $ 985 $ 1,321    
Tax expense, entities included in effective tax rate calculation   $ 621   $ 1,500    
Decrease in uncertain tax positions from settlement of transfer pricing matters 412          
Net deferred tax assets $ 22,500   $ 22,500      
Operating Loss Carryforwards [Line Items]            
Tax expense related to tax reform legislation         $ 7,300  
Forecast [Member] | Germany [Member] | Foreign Tax Authority [Member]            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards           $ 3,300
Deferred tax assets           $ 1,000