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Common, Preferred and Treasury Stock (Accelerated Share Repurchase Transactions) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accelerated Share Repurchases        
Shares acquired for treasury   $ 1,453 $ 1,605 $ 661
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      
Shares repurchased on repurchase date 4,843,750      
Shares received from forward contract settlement 1,044,362      
Total shares repurchased 5,888,112      
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      
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      
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      
Settlement date Mar. 19, 2018      
December 19. 2017 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury $ 273      
Shares repurchased on repurchase date 7,727,273      
Shares received from forward contract settlement 824,367      
Total shares repurchased 8,551,640      
February 12, 2018 ASR        
Accelerated Share Repurchases        
Redemption date Feb. 12, 2018      
Settlement date Mar. 26, 2018      
February 12, 2018 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury $ 318      
Shares repurchased on repurchase date 8,691,318      
Shares received from forward contract settlement 1,015,731      
Total shares repurchased 9,707,049      
May 25, 2018 ASR        
Accelerated Share Repurchases        
Redemption date May 25, 2018      
Settlement date Jun. 15, 2018      
May 25, 2018 ASR | March 2016 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury $ 235      
Shares repurchased on repurchase date 6,402,244      
Shares received from forward contract settlement 1,172,122      
Total shares repurchased 7,574,366      
July 20, 2018 through August 2, 2018 Open Market Repurchase        
Accelerated Share Repurchases        
Settlement date Aug. 06, 2018      
July 20, 2018 through August 2, 2018 Open Market Repurchase | March 2018 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury $ 500      
Shares repurchased on repurchase date 16,945,020      
Settlement date Jul. 24, 2018      
October 24, 2018 through November 9, 2018 Open Market Repurchase        
Accelerated Share Repurchases        
Settlement date Nov. 14, 2018      
October 24, 2018 through November 9, 2018 Open Market Repurchase | March 2018 Repurchase Program        
Accelerated Share Repurchases        
Shares acquired for treasury $ 400      
Shares repurchased on repurchase date 14,916,332      
Settlement date Oct. 26, 2018