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Contingencies and Certain Commitments (Details) - USD ($)
$ / shares in Units, shares in Millions
Mar. 14, 2018
Mar. 12, 2018
Jul. 01, 2018
Apr. 30, 2018
Commitments and Contingencies Disclosure [Abstract]        
Share repurchase agreement, amount   $ 4,000,000,000    
Accelerated share repurchases, cash paid $ 4,000,000,000      
Shares repurchased 87      
Shares repurchased, price per share (in dollars per share) $ 36.61      
Shares received in initial delivery, percentage of agreement amount   80.00%    
Remaining authorized repurchase amount     $ 10,300,000,000  
Office Building In Hudson Yards Neighborhood Of New York City [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Term of corporate headquarters lease agreement       20 years
Future minimum commitment for corporate headquarters lease       $ 1,700,000,000