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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($)
$ in Millions
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption $ 0 [1]       $ 0 $ 0
Reclassification from retained earnings of cumulative effect adjustment to initially apply new accounting guidance for financial liabilities measured under the fair value option, net of tax 0 [1]       0 0
Balance at beginning of period at Dec. 31, 2014   $ 1,565        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Preferred stock issuance   0        
Preferred stock redemption   (300)        
Balance at end of period at Dec. 31, 2015 20,525 $ 1,265        
Balance at beginning of period at Dec. 31, 2014     $ 0 $ 14,170 1,233 (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Capital contribution from parent       4,000    
Employee benefit plans       (1)    
Net income (loss) 330       330  
Cash dividends declared on preferred stock         (65)  
Other comprehensive income (loss), net of tax (406)         (406)
Balance at end of period (As Previously Reported [Member]) at Dec. 31, 2015         1,498 (407)
Balance at end of period at Dec. 31, 2015 19,260   $ 0 18,169 1,498 (407)
Number of shares at beginning of period at Dec. 31, 2014   25,947,500 713      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Number of shares of preferred stock issued to parent   0 1      
Number of shares of preferred stock redeemed   (4,500,000)        
Number of shares at end of period at Dec. 31, 2015   21,447,500 714      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption 0 [1]       0 0
Reclassification from retained earnings of cumulative effect adjustment to initially apply new accounting guidance for financial liabilities measured under the fair value option, net of tax 0 [1]       0 0
Preferred stock issuance   $ 1,265        
Preferred stock redemption   (1,265)        
Balance at end of period at Dec. 31, 2016 20,355 $ 1,265        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Capital contribution from parent       0    
Employee benefit plans       (21)    
Net income (loss) 129       129  
Cash dividends declared on preferred stock         (67)  
Other comprehensive income (loss), net of tax (211)         (211)
Balance at end of period (As Previously Reported [Member]) at Dec. 31, 2016         1,560 (618)
Balance at end of period at Dec. 31, 2016 19,090   $ 0 18,148 1,386 (444)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Number of shares of preferred stock issued to parent   1,265 0      
Number of shares of preferred stock redeemed   (21,447,500)        
Number of shares at end of period at Dec. 31, 2016   1,265 714      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of new accounting principle in period of adoption 174 [1]       (174) 174
Reclassification from retained earnings of cumulative effect adjustment to initially apply new accounting guidance for financial liabilities measured under the fair value option, net of tax 174 [1]       (174) 174
Preferred stock issuance   $ 0        
Preferred stock redemption   0        
Balance at end of period at Dec. 31, 2017 20,094 $ 1,265        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Capital contribution from parent       0    
Employee benefit plans       (18)    
Net income (loss) (179)       (179)  
Cash dividends declared on preferred stock         (77)  
Other comprehensive income (loss), net of tax 13         13
Balance at end of period at Dec. 31, 2017 $ 18,829   $ 0 $ 18,130 $ 1,130 $ (431)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Number of shares of preferred stock issued to parent   0 0      
Number of shares of preferred stock redeemed   0        
Number of shares at end of period at Dec. 31, 2017   1,265 714      
[1] See Note 2, "Summary of Significant Accounting Polices and New Accounting Pronouncements," for additional discussion.