Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period $ 11,668 $ 11,472 $ 11,102 $ 11,102 $ 10,814  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   1     1  
Other comprehensive income before reclassifications 91 (64)   415 (281)  
Amounts reclassified from accumulated OCI to earnings 7 3   19 20  
Period change 98 (61)   434 (261)  
Balance, end of period 11,909 10,934 11,668 11,909 10,934  
Unrealized gains and (losses) on debt securities | Debt Securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period (83) (482) (363) (363) (278)  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets           $ (1)
Other comprehensive income before reclassifications 63 (64)   333 (281)  
Amounts reclassified from accumulated OCI to earnings 6 2   16 17  
Period change 69 (62)   349 (264)  
Balance, end of period (14) (543) (83) (14) (543)  
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] | Equity Securities [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period 54   0 0    
Other comprehensive income before reclassifications 28     82    
Amounts reclassified from accumulated OCI to earnings 0     0    
Period change 28     82    
Balance, end of period 82   54 82    
Unrealized gains (losses) for pension and other post- retirement obligations            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period (244) (248) (246) (246) (250)  
Other comprehensive income before reclassifications 0 0   0 0  
Amounts reclassified from accumulated OCI to earnings 1 1   3 3  
Period change 1 1   3 3  
Balance, end of period (243) (247) (244) (243) (247)  
Accumulated Other Comprehensive Loss            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, beginning of period (273) (730) (609) (609) (528)  
Balance, end of period $ (175) $ (790) (273) (175) (790)  
Reclassification out of Accumulated Other Comprehensive Income            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Net unrealized loss on securities transfer     $ (131) $ (126) $ (141)