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Earnings Per Share - Narrative (Details) - USD ($)
shares in Thousands
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Feb. 28, 2018
Oct. 10, 2018
Sep. 30, 2018
Sep. 30, 2017
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Jul. 19, 2018
Apr. 30, 2018
Jan. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                    
Share repurchase program $ 1,500,000,000.0   $ 5,000,000,000     $ 5,000,000,000        
Shares repurchased value     $ 1,000,000,000 $ 1,000,000,000   $ 2,816,000,000 $ 1,763,000,000      
Accelerated share repurchase program (payment) receipt amount $ 30,000,000       $ 90,000,000     $ 500,000,000 $ 450,000,000 $ 150,000,000
Initial share value received               $ 400,000,000 $ 360,000,000 $ 120,000,000
Initial shares received               6,000 6,000  
Shares repurchased during the period (in shares) 3,000   15,000 20,000 7,000 46,000 35,000      
Subsequent Event                    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                    
Accelerated share repurchase program (payment) receipt amount   $ 100,000,000                
Shares repurchased during the period (in shares)   7,000                
Employee Stock Option                    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                    
Antidilutive securities     7 10,000