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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   19      
Net income (loss)     (42)   $ (42)
Retirement of common stock/cancellation of shares   (100) (125)    
Common stock dividends declared     (157)    
Other comprehensive income (loss), net of tax       1,650 1,650
Balance as of end-of-period at Jun. 30, 2020   5,081 8,327 7,323 20,731
Balance as of beginning-of-period at Mar. 31, 2020   5,071 8,500 3,004  
Stock compensation/issued for benefit plans   10      
Net income (loss)     (94)   (94)
Common stock dividends declared     (79)    
Other comprehensive income (loss), net of tax       4,319 4,319
Balance as of end-of-period at Jun. 30, 2020   5,081 8,327 7,323 20,731
Balance as of beginning-of-period at Dec. 31, 2020   5,082 8,686 8,931 22,699
Stock compensation/issued for benefit plans   48      
Net income (loss)     867   867
Retirement of common stock/cancellation of shares   (109) (146)    
Common stock dividends declared     (162)    
Other comprehensive income (loss), net of tax       (1,452) (1,452)
Balance as of end-of-period at Jun. 30, 2021   5,021 9,245 7,479 21,745
Balance as of beginning-of-period at Mar. 31, 2021   5,057 8,775 5,761  
Stock compensation/issued for benefit plans   23      
Net income (loss)     642   642
Retirement of common stock/cancellation of shares   (59) (91)    
Common stock dividends declared     (81)    
Other comprehensive income (loss), net of tax       1,718 1,718
Balance as of end-of-period at Jun. 30, 2021   $ 5,021 $ 9,245 $ 7,479 $ 21,745