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Equity (Deficit) Changes in AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Statutory corporate tax rate 21.00% 21.00% 35.00% 35.00%
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance $ (3,686) $ (3,686)    
Total other comprehensive loss   (348) $ (206) $ (648)
Ending balance   6,240 (3,686)  
Accumulated Net Unrealized Investment Gain (Loss), AFS Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect   110 0  
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance 510 510 716  
Other comprehensive income (loss) before reclassifications   (79) 53  
Amounts reclassified from other comprehensive income   (265) (259)  
Total other comprehensive loss   (344) (206)  
Ending balance   276 510 716
Accumulated Other Comprehensive Income (Loss), Other [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect   7 0  
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance 43 43 43  
Other comprehensive income (loss) before reclassifications   7 8  
Amounts reclassified from other comprehensive income   (11) (8)  
Total other comprehensive loss   (4) 0  
Ending balance   46 43 43
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect   117 0  
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance $ 553 553 759  
Other comprehensive income (loss) before reclassifications   (72) 61  
Amounts reclassified from other comprehensive income   (276) (267)  
Total other comprehensive loss   (348) (206)  
Ending balance   $ 322 $ 553 $ 759