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Common, Preferred and Treasury Stock (Accelerated Share Repurchase Transactions) (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accelerated Share Repurchases        
Shares acquired for treasury   $ 1,605,000,000 $ 661,000,000 $ 850,000,000
December 14, 2015 ASR        
Accelerated Share Repurchases        
Redemption date   Dec. 14, 2015    
Settlement date   Jan. 14, 2016    
December 14, 2015 ASR | March 2014 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury   $ 215,000,000    
Shares repurchased on repurchase date   9,248,482    
Shares received from forward contract settlement   1,782,477    
Total shares repurchased   11,030,959    
March 4, 2016 ASR        
Accelerated Share Repurchases        
Redemption date   Mar. 04, 2016    
Settlement date   Apr. 11, 2016    
March 4, 2016 ASR | March 2014 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury   $ 240,000,000    
Shares repurchased on repurchase date   12,623,762    
Shares received from forward contract settlement   1,868,379    
Total shares repurchased   14,492,141    
August 5, 2016 ASR        
Accelerated Share Repurchases        
Redemption date   Aug. 05, 2016    
Settlement date   Nov. 07, 2016    
August 5, 2016 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury   $ 240,000,000    
Shares repurchased on repurchase date   10,979,548    
Shares received from forward contract settlement   1,099,205    
Total shares repurchased   12,078,753    
December 20, 2016 ASR        
Accelerated Share Repurchases        
Redemption date   Dec. 20, 2016    
Settlement date   Feb. 06, 2017    
December 20, 2016 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury   $ 155,000,000    
Shares repurchased on repurchase date   4,843,750    
Shares received from forward contract settlement   1,044,362    
Total shares repurchased   5,888,112    
June 15, 2016 Open Market Repurchase | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury $ 26,000,000      
Shares repurchased on repurchase date 1,436,100      
Total shares repurchased 1,436,100      
Settlement date Jun. 20, 2016      
May 1, 2017 ASR        
Accelerated Share Repurchases        
Redemption date   May 01, 2017    
Settlement date   Jul. 31, 2017    
May 1, 2017 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury   $ 342,000,000    
Shares repurchased on repurchase date   11,641,971    
Shares received from forward contract settlement   2,248,250    
Total shares repurchased   13,890,221    
August 17, 2017 ASR        
Accelerated Share Repurchases        
Redemption date   Aug. 17, 2017    
Settlement date   Dec. 18, 2017    
August 17, 2017 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury   $ 990,000,000    
Shares repurchased on repurchase date   31,540,480    
Shares received from forward contract settlement   4,291,170    
Total shares repurchased   35,831,650    
December 19. 2017 ASR        
Accelerated Share Repurchases        
Redemption date   Dec. 19, 2017    
December 19. 2017 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury   $ 273,000,000    
Shares repurchased on repurchase date   7,727,273