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Stockholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total Accumulated OCI Balance $ 1,010 $ 495 $ 1,010 $ 495 $ 1,100 $ (66) $ 4 $ 430
OCI before reclassifications (97) 467 1,038 (14)        
Amounts reclassified from accumulated OCI 7 24 38 79        
Total Accumulated OCI Balance (54) 63 (76) 104        
Agency Securities [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning OCI Balance 1,108 89 (27) 570        
OCI before reclassifications (36) 428 1,152 (39)        
Amounts reclassified from accumulated OCI (61) 39 (114) 25        
Ending OCI Balance 1,011 556 1,011 556        
Discontinuation of Election to Account for Interest Rate Swaps as Designated Cash Flow Hedges [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Net Unrealized Gain (Loss) on Swaps (1) (61) (1) (61) $ (8) $ (39) $ (85) $ (140)
Interest Rate Swap [Member] | Agency Securities [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
OCI before reclassifications $ (36) $ 428 $ 1,152 $ (39)