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Consolidated Statements Of Stockholders' Equity - USD ($)
$ in Millions
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance as of beginning-of-period at Dec. 31, 2019 $ (203) $ 5,162 $ 8,854 $ 5,673  
Stock compensation/issued for benefit plans   31      
Net income (loss)     356   $ 356
Retirement of common stock/cancellation of shares   (100) (125)    
Common stock dividends declared     (235)    
Other comprehensive income (loss), net of tax       2,136 2,136
Balance as of end-of-period at Sep. 30, 2020   5,093 8,647 7,809 21,549
Balance as of beginning-of-period at Jun. 30, 2020   5,081 8,327 7,323  
Stock compensation/issued for benefit plans   12      
Net income (loss)     398   398
Common stock dividends declared     (78)    
Other comprehensive income (loss), net of tax       486 486
Balance as of end-of-period at Sep. 30, 2020   5,093 8,647 7,809 21,549
Balance as of beginning-of-period at Dec. 31, 2020   5,082 8,686 8,931 22,699
Stock compensation/issued for benefit plans   64      
Net income (loss)     1,185   1,185
Retirement of common stock/cancellation of shares   (190) (265)    
Common stock dividends declared     (241)    
Other comprehensive income (loss), net of tax       (2,082) (2,082)
Balance as of end-of-period at Sep. 30, 2021   4,956 9,365 6,849 21,170
Balance as of beginning-of-period at Jun. 30, 2021   5,021 9,245 7,479  
Stock compensation/issued for benefit plans   16      
Net income (loss)     318   318
Retirement of common stock/cancellation of shares   (81) (119)    
Common stock dividends declared     (79)    
Other comprehensive income (loss), net of tax       (630) (630)
Balance as of end-of-period at Sep. 30, 2021   $ 4,956 $ 9,365 $ 6,849 $ 21,170