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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Nonredeemable Preferred Stock
Common Stock
Capital Surplus
Accumulated Other Comprehensive (Loss) Income
Retained Earnings
Treasury Stock
BALANCE (in shares)     160.1        
BALANCE at Dec. 31, 2018 $ 7,507   $ 1,141 $ 2,148 $ (686) $ 8,858 $ (3,954)
Cumulative effect of change in accounting principle (14)         (14)  
Net income (loss) 1,202 [1]         1,202  
Other comprehensive income (loss), net of tax 370       370    
Cash dividends declared on common stock (398)         (398)  
Purchase of common stock (in shares)     (18.7)        
Purchase of common stock (1,380)           (1,380)
Issuance of preferred stock 0            
Net issuance of common stock under employee stock plans (in shares)     0.7        
Net issuance of common stock under employee stock plans 1     (13)   (29) 43
Share-based compensation 39     39      
BALANCE at Dec. 31, 2019 7,327   $ 1,141 2,174 (316) 9,619 (5,291)
BALANCE (in shares)     142.1        
Cumulative effect of change in accounting principle 13         13  
Net income (loss) 497 [1]         497  
Other comprehensive income (loss), net of tax 380       380    
Cash dividends declared on common stock (378)         (378)  
Dividends, Preferred Stock, Cash (13)         (13)  
Purchase of common stock (in shares)     (3.4)        
Purchase of common stock (194)           (194)
Issuance of preferred stock 394 $ 394          
Net issuance of common stock under employee stock plans (in shares)     0.5        
Net issuance of common stock under employee stock plans 0     (13)   (11) 24
Share-based compensation 24     24      
BALANCE at Dec. 31, 2020 8,050 394 $ 1,141 2,185 64 9,727 (5,461)
BALANCE (in shares)     139.2        
Net income (loss) 1,168         1,168  
Other comprehensive income (loss), net of tax (276)       (276)    
Cash dividends declared on common stock (365)         (365)  
Dividends, Preferred Stock, Cash (23)         (23)  
Purchase of common stock (in shares)     (9.5)        
Purchase of common stock (723)     (24)     (699)
Issuance of preferred stock 0            
Net issuance of common stock under employee stock plans (in shares)     1.0        
Net issuance of common stock under employee stock plans 25     (27)   (13) 65
Share-based compensation 41     41      
BALANCE at Dec. 31, 2021 $ 7,897 $ 394 $ 1,141 $ 2,175 $ (212) $ 10,494 $ (6,095)
BALANCE (in shares)     130.7        
[1] See Defined Benefit Pension and Other Postretirement Costs in Note 1.