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Consolidated Statement of Changes in Equity - USD ($)
$ in Millions
Total
Total
Common Shares
Common Stock and Capital Surplus
Retained Earnings
Accumulated Other Comprehensive Inc. (Loss)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of accounting change $ 2 $ 2     $ 2    
Beginning Balance, shares at Dec. 31, 2014     87,708,793        
Beginning Balance at Dec. 31, 2014 5,054 4,879   $ 1,240 2,912 $ 727 $ 175
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net earnings 370 352     352   18
Other comprehensive income (loss) (431) (423)       (423) (8)
Dividends on Common Stock (178) (178)     (178)    
Shares issued:              
Exercise of stock options, shares     1,475,202        
Exercise of stock options 47 47   47      
Restricted stock awards, shares     171,130        
Restricted stock awards 0 0   0      
Other benefit plans, shares     111,681        
Other benefit plans 7 7   7      
Dividend reinvestment plan, shares     26,167        
Dividend reinvestment plan 2 2   2      
Stock-based compensation:              
Stock-based compensation: Expense 21 21   21      
Stock-based compensation: Excess tax benefits 12 12   12      
Shares acquired and retired, shares     (1,955,186)        
Shares acquired and retired (126) (126)   (27) (99)    
Shares exchanged — benefit plans, shares     (45,765)        
Shares exchanged — benefit plans (3) (3)   (1) (2)    
Forfeitures of restricted stock, shares     (17,570)        
Forfeitures of restricted stock 0 0   0      
Other (7)       0   (7)
Ending Balance, shares at Dec. 31, 2015     87,474,452        
Ending Balance at Dec. 31, 2015 4,770 4,592   1,301 2,987 304 178
Beginning Balance, Redeemable Noncontrolling Interests at Dec. 31, 2014 0            
Ending Balance, Redeemable Noncontrolling Interests at Dec. 31, 2015 0            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net earnings 668 649     649   19
Other comprehensive income (loss) 67 62       62 5
Dividends on Common Stock (187) (187)     (187)    
Shares issued:              
Exercise of stock options, shares     958,344        
Exercise of stock options 32 32   32      
Restricted stock awards, shares     318,940        
Restricted stock awards 0 0   0      
Other benefit plans, shares     95,875        
Other benefit plans 7 7   7      
Dividend reinvestment plan, shares     25,516        
Dividend reinvestment plan 2 2   2      
Stock-based compensation:              
Stock-based compensation: Expense 22 22   22      
Shares acquired and retired, shares     (1,911,976)        
Shares acquired and retired (133) (133)   (29) (104)    
Shares exchanged — benefit plans, shares     (32,707)        
Shares exchanged — benefit plans (2) (2)   0 (2)    
Forfeitures of restricted stock, shares     (4,045)        
Forfeitures of restricted stock 0 0   0      
Acquisition of noncontrolling interests (315) (128)   (137)   9 [1] (187)
Other $ (12) 0     0 0 (12)
Ending Balance, shares at Dec. 31, 2016 86,924,399   86,924,399        
Ending Balance at Dec. 31, 2016 $ 4,919 4,916   1,198 3,343 375 3
Ending Balance, Redeemable Noncontrolling Interests at Dec. 31, 2016 0            
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract]              
Redeemable noncontrolling interests 0            
Net earnings 477 475     475   2
Other comprehensive income (loss) 296 296       296 0
Dividends on Common Stock $ (421) (421)     (421)    
Exercise of stock options, shares 1,020,986   1,020,986        
Exercise of stock options $ 34 34   34      
Restricted stock awards, shares     232,250        
Restricted stock awards 0 0   0      
Other benefit plans, shares     99,588        
Other benefit plans 10 10   10      
Dividend reinvestment plan, shares     42,572        
Dividend reinvestment plan 4 4   4      
Stock-based compensation: Expense 24 24   24      
Shares exchanged — benefit plans, shares     (37,718)        
Shares exchanged — benefit plans (5) (5)   (1) (4)    
Forfeitures of restricted stock, shares     (6,617)        
Forfeitures of restricted stock 0 0   0      
Sale of redeemable noncontrolling interests (3) (3)       (3) 0
Other $ (4)           (4)
Ending Balance, shares at Dec. 31, 2017 88,275,460   88,275,460        
Ending Balance at Dec. 31, 2017 $ 5,331 5,330   $ 1,269 3,248 813 1
Ending Balance, Redeemable Noncontrolling Interests at Dec. 31, 2017 3            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of accounting change 0 $ 0     $ (145) $ 145 $ 0
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract]              
Redeemable noncontrolling interests $ 3            
[1] Other includes the December 2017 reclassification of $145 million stranded in AOCI from accounting for the Tax Cuts and Jobs Act of 2017 to retained earnings (see Note A — “Accounting Policies — Income Taxes”), and the impact on AOCI of the December 2017 sale of redeemable noncontrolling interests in Neon and the November 2016 acquisition of the noncontrolling interest in NATL (see Note B — “Acquisitions and Sale of Businesses”).