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Consolidated Statements Of Stockholders' Equity - USD ($)
$ in Millions
Common Stock [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance as of beginning-of-period at Dec. 31, 2019 $ 5,162 $ (203) $ 8,854 $ 5,673  
Stock compensation/issued for benefit plans 9        
Net income (loss)     52   $ 52
Retirement of common stock/cancellation of shares (100)   (125)    
Common stock dividends declared     (78)    
Other comprehensive income (loss), net of tax       (2,669) (2,669)
Balance as of end-of-period at Mar. 31, 2020 5,071   8,500 3,004 16,575
Balance as of beginning-of-period at Dec. 31, 2020 5,082   8,686 8,931 22,699
Stock compensation/issued for benefit plans 25        
Net income (loss)     225   225
Retirement of common stock/cancellation of shares (50)   (55)    
Common stock dividends declared     (81)    
Other comprehensive income (loss), net of tax       (3,170) (3,170)
Balance as of end-of-period at Mar. 31, 2021 $ 5,057   $ 8,775 $ 5,761 $ 19,593