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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common equities
Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income
Treasury Stock
Beginning Balance (Previously Reported) at Dec. 31, 2016       $ 5,037 $ 1,693  
Beginning Balance at Dec. 31, 2016   $ 397 $ 1,252 5,037 1,693 $ (1,319)
Share-based awards   0 (18)     19
Share-based compensation     14      
Other     1     2
Net Income $ 301     301    
Dividends declared       (164)    
Other comprehensive income (loss) 232       232  
Shares acquired - share repurchase authorization           (70)
Shares acquired - share-based compensation plans           (4)
Ending Balance at Jun. 30, 2017 7,373 $ 397 1,249 5,174 1,925 (1,372)
Beginning Balance (in shares) at Dec. 31, 2016   164.4        
Share-based awards (in shares)   0.6        
Shares acquired - share repurchase authorization (in shares)   (1.0)        
Shares acquired - share-based compensation plans (in shares)   (0.1)        
Ending Balance (in shares) at Jun. 30, 2017   163.9        
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax 0          
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax         (2,503)  
Beginning Balance (Previously Reported) at Dec. 31, 2017       5,180 2,788  
Beginning Balance at Dec. 31, 2017 8,243 $ 397 1,265 7,683 285 (1,387)
Share-based awards   0 (17)     16
Share-based compensation     16      
Other     2     1
Net Income 186     186    
Dividends declared       (173)    
Other comprehensive income (loss) (230)       (230)  
Shares acquired - share repurchase authorization           (125)
Shares acquired - share-based compensation plans           (3)
Ending Balance at Jun. 30, 2018 $ 7,916 $ 397 $ 1,266 7,696 55 $ (1,498)
Beginning Balance (in shares) at Dec. 31, 2017 198.3 163.9        
Share-based awards (in shares)   0.5        
Shares acquired - share repurchase authorization (in shares)   (1.8)        
Shares acquired - share-based compensation plans (in shares)   0.0        
Ending Balance (in shares) at Jun. 30, 2018 198.3 162.6        
Unrealized gains reclassified to retained earnings for ASU 2016-01, after tax $ 2,503     $ 2,503 $ (2,503)