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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Beginning balance at Dec. 31, 2017 $ 12,530 $ 0 $ 12,053 $ 8,256 $ (7,621) $ (158)
Beginning balance (shares) at Dec. 31, 2017   715       7
Net income 557     557    
Change in accounting principle and other (245)     (139) (106)  
Dividends declared (216)     (216)    
Other comprehensive income 46       46  
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) [1] (26)   10     $ (36)
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) (shares) [1]   1       1
Stock options exercised 1   1      
Stock options exercised (shares)   1        
Stock purchased and retired (325)   (97) (228)    
Stock purchased and retired (shares)   (6)        
Ending balance at Mar. 31, 2018 12,322 $ 0 11,967 8,230 (7,681) $ (194)
Ending balance (shares) at Mar. 31, 2018   711       8
Beginning balance at Dec. 31, 2017 12,530 $ 0 12,053 8,256 (7,621) $ (158)
Beginning balance (shares) at Dec. 31, 2017   715       7
Net income 2,916          
Ending balance at Sep. 30, 2018 13,491 $ 0 11,740 9,483 (7,535) $ (197)
Ending balance (shares) at Sep. 30, 2018   694       8
Beginning balance at Mar. 31, 2018 12,322 $ 0 11,967 8,230 (7,681) $ (194)
Beginning balance (shares) at Mar. 31, 2018   711       8
Net income 1,036     1,036    
Change in accounting principle and other (13)     (13)    
Dividends declared (213)     (213)    
Other comprehensive income 75       75  
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) [1] 27   29     $ (2)
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) (shares) [1]   0       0
Stock purchased and retired (600)   (189) (411)    
Stock purchased and retired (shares)   (12)        
Ending balance at Jun. 30, 2018 12,634 $ 0 11,807 8,629 (7,606) $ (196)
Ending balance (shares) at Jun. 30, 2018   699       8
Net income 1,322     1,322    
Dividends declared (242)     (242)    
Other comprehensive income 71       71  
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) [1] 31   32     $ (1)
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) (shares) [1]   0       0
Stock purchased and retired (325)   (99) (226)    
Stock purchased and retired (shares)   (5)        
Ending balance at Sep. 30, 2018 13,491 $ 0 11,740 9,483 (7,535) $ (197)
Ending balance (shares) at Sep. 30, 2018   694       8
Beginning balance at Dec. 31, 2018 13,687 $ 0 11,671 10,039 (7,825) $ (198)
Beginning balance (shares) at Dec. 31, 2018   688       8
Net income 730     730    
Dividends declared (232)     (232)    
Other comprehensive income 59       59  
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) [1] (8)   27     $ (35)
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) (shares) [1]   2       1
Stock purchased and retired (1,325)   (444) (881)    
Stock purchased and retired (shares)   (26)        
Ending balance at Mar. 31, 2019 12,911 $ 0 11,254 9,656 (7,766) $ (233)
Ending balance (shares) at Mar. 31, 2019   664       9
Beginning balance at Dec. 31, 2018 13,687 $ 0 11,671 10,039 (7,825) $ (198)
Beginning balance (shares) at Dec. 31, 2018   688       8
Net income 3,669          
Ending balance at Sep. 30, 2019 15,068 $ 0 11,177 11,772 (7,645) $ (236)
Ending balance (shares) at Sep. 30, 2019   656       9
Beginning balance at Mar. 31, 2019 12,911 $ 0 11,254 9,656 (7,766) $ (233)
Beginning balance (shares) at Mar. 31, 2019   664       9
Net income 1,443     1,443    
Dividends declared (229)     (229)    
Other comprehensive income 72       72  
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) [1] 29   31     $ (2)
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) (shares) [1]   0       0
Stock purchased and retired (268)   (84) (184)    
Stock purchased and retired (shares)   (5)        
Ending balance at Jun. 30, 2019 13,958 $ 0 11,201 10,686 (7,694) $ (235)
Ending balance (shares) at Jun. 30, 2019   659       9
Net income 1,495     1,495    
Dividends declared (261)     (261)    
Other comprehensive income 49       49  
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) [1] 35   36     $ (1)
Shares of common stock issued and compensation expense associated with equity awards (Treasury shares withheld for payment of taxes) (shares) [1]   0       0
Stock purchased and retired (208)   (60) (148)    
Stock purchased and retired (shares)   (3)        
Ending balance at Sep. 30, 2019 $ 15,068 $ 0 $ 11,177 $ 11,772 $ (7,645) $ (236)
Ending balance (shares) at Sep. 30, 2019   656       9
[1]
Weighted average price per share.