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Equity Changes in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance $ 6,071  
Total other comprehensive income (loss) 6 $ (200)
Ending balance 3,379  
Accumulated net unrealized investment gain (loss), AFS securities [Member]    
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance 716 1,358
Other comprehensive income (loss) before reclassifications 9 (89)
Amounts reclassified from other comprehensive income (loss) (1) (109)
Total other comprehensive income (loss) 8 (198)
Ending balance 724 1,160
Accumulated other comprehensive income (loss), Other [Member]    
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance 43 49
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from other comprehensive income (loss) (2) (2)
Total other comprehensive income (loss) (2) (2)
Ending balance 41 47
Accumulated other comprehensive income [Member]    
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance 759 1,407
Other comprehensive income (loss) before reclassifications 9 (89)
Amounts reclassified from other comprehensive income (loss) (3) (111)
Total other comprehensive income (loss) 6 (200)
Ending balance $ 765 $ 1,207