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Pledged Assets (Offsetting Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Offsetting Assets and Liabilities [Line Items]    
Collateral Received $ (5,056)  
Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 12,360 $ 12,139
Gross Amount Offset in the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Consolidated Balance Sheets 12,360 12,139
Financial Instruments (7,224) (6,522)
Collateral Received   (5,328)
Net Amount 80 289
Assets [Member] | ERROR in label resolution.    
Offsetting Assets and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 294 116
Net Amounts of Assets Presented in the Consolidated Balance Sheets 294 116
Financial Instruments 0 0
Collateral Received (293) (105)
Net Amount 1 11
Assets [Member] | TBA and Forward Settling Agency Securities [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 87 275
Net Amounts of Assets Presented in the Consolidated Balance Sheets 87 275
Financial Instruments (8) 0
Net Amount 79 275
Assets [Member] | Reverse Repurchase Agreements [Member]    
Offsetting Assets and Liabilities [Line Items]    
Net Amount 0 3
Liability [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 48,745 52,366
Gross Amount Offset in the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Consolidated Balance Sheets 48,745 52,366
Financial Instruments (7,224) (6,522)
Collateral Received (41,520) (45,844)
Net Amount 1  
Liability [Member] | Repurchase Agreements [Member]    
Offsetting Assets and Liabilities [Line Items]    
Net Amount 1 0
Liability [Member] | ERROR in label resolution.    
Offsetting Assets and Liabilities [Line Items]    
Net Amount   0
Liability [Member] | TBA and Forward Settling Agency Securities [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 8  
Net Amounts of Assets Presented in the Consolidated Balance Sheets 8  
Financial Instruments (8)  
Collateral Received 0  
Net Amount 0  
Reverse Repurchase Agreements [Member] | Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 11,979 11,748
Gross Amount Offset in the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Consolidated Balance Sheets 11,979 11,748
Financial Instruments (7,216) (6,522)
Collateral Received (4,763) (5,223)
Repurchase Agreements [Member] | Liability [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 48,737 52,366
Gross Amount Offset in the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented in the Consolidated Balance Sheets 48,737 52,366
Financial Instruments (7,216) (6,522)
Collateral Received $ (41,520) $ (45,844)