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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]
As Previously Reported [Member]
Retained Earnings [Member]
As Previously Reported [Member]
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]         $ 0      
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Equity Investments Previously Classified as Available-for-sale [Member]         0 $ 0    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Equity Investments Previously Measured at Cost [Member]         0      
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]         0 0    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Fair Value Option [Member]         (174) 174    
Balance at beginning of period, shares at Dec. 31, 2016   1,265 714          
Balance at beginning of period at Dec. 31, 2016   $ 1,265            
Balance at beginning of period at Dec. 31, 2016     $ 0 $ 18,148 1,386 (444) $ 1,560 $ (618)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Return of capital to parent       0        
Employee benefit plans       (18)        
Net income (loss) $ (179)       (179)      
Cash dividends declared on preferred stock         (77)      
Other comprehensive income, net of tax 13         13    
Balance at end of period, shares at Dec. 31, 2017   1,265 714          
Balance at end of period at Dec. 31, 2017 18,829   $ 0 18,130 1,227 (518) 1,130 $ (431)
Balance at end of period at Dec. 31, 2017 20,094 $ 1,265            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]         0      
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Equity Investments Previously Classified as Available-for-sale [Member]         (4) 4    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Equity Investments Previously Measured at Cost [Member]         10      
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]         91 (91)    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Fair Value Option [Member]         0 0    
Return of capital to parent       0        
Employee benefit plans       6        
Net income (loss) 320       320      
Cash dividends declared on preferred stock         (76)      
Other comprehensive income, net of tax 152         152    
Balance at end of period, shares at Dec. 31, 2018   1,265 714          
Balance at end of period at Dec. 31, 2018 19,241   $ 0 18,136 1,498 (366) $ 1,471  
Balance at end of period at Dec. 31, 2018 20,506 $ 1,265            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-02 [Member]         27      
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Equity Investments Previously Classified as Available-for-sale [Member]         0 0    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Equity Investments Previously Measured at Cost [Member]         0      
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]         0 0    
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01, Fair Value Option [Member]         0 0    
Return of capital to parent       (2,400)        
Employee benefit plans       0        
Net income (loss) 113       113      
Cash dividends declared on preferred stock         (77)      
Other comprehensive income, net of tax 87         87    
Balance at end of period, shares at Dec. 31, 2019   1,265 714          
Balance at end of period at Dec. 31, 2019 16,991   $ 0 $ 15,736 $ 1,534 $ (279)    
Balance at end of period at Dec. 31, 2019 $ 18,256 $ 1,265