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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Millions
Total
Common stock:
Additional paid-in capital:
Retained earnings:
Accumulated other comprehensive income (loss):
Treasury stock:
Balance, beginning of period at Dec. 31, 2016   $ 135 $ 1,908 $ 25,981 $ 2,630 $ (10,172)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options     33      
Share-based compensation     38      
Treasury stock reissued     30     38
Net earnings $ 2,021     2,021    
Dividends to shareholders       (513)    
Unrealized foreign currency translation gains (losses) during period, net of income taxes         268  
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments [1]         632  
Unrealized gains (losses) on derivatives during period, net of income taxes         1  
Pension liability adjustment during period, net of income taxes         0  
Purchases of treasury stock           (1,053)
Balance, end of period at Sep. 30, 2017 21,977 135 2,009 27,489 3,531 (11,187)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2016-01 [1]       0 0  
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2018-02 [1]       0 0  
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2016-01 [1]       148 (148)  
Cumulative effect of change in accounting principle, net of income taxes | Accounting Standards Update 2018-02 [1]       (374) 374  
Balance, beginning of period at Dec. 31, 2017 24,598 135 2,052 29,895 4,028 (11,512)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options     30      
Share-based compensation     39      
Treasury stock reissued     30     29
Net earnings 2,395     2,395    
Dividends to shareholders       (603)    
Unrealized foreign currency translation gains (losses) during period, net of income taxes         (38)  
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments [1]         (2,310)  
Unrealized gains (losses) on derivatives during period, net of income taxes         2  
Pension liability adjustment during period, net of income taxes         1  
Purchases of treasury stock           (939)
Balance, end of period at Sep. 30, 2018 $ 23,234 $ 135 $ 2,151 $ 31,461 $ 1,909 $ (12,422)
[1] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018.