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Assets Subject to Netting (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivatives [Abstract]    
Gross amounts of recognized assets $ 4,990 $ 5,870
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [1] (3,512) (3,978)
Cash collateral (1,211) (1,452)
Securities collateral (252) (315)
Net amount 15 125
Securities borrowed [Abstract]    
Gross amounts of recognized assets 257 147
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [1] (23) (43)
Securities collateral (228) (103)
Net amount 6 1
Total [Abstract]    
Gross amounts of recognized assets 5,247 6,017
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [1] (3,535) (4,021)
Cash collateral (1,211) (1,452)
Securities collateral (480) (418)
Net amount 21 126
OTC [Member]    
Derivatives [Abstract]    
Gross amounts of recognized assets 4,704 5,501
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [1] (3,365) (3,862)
Cash collateral (1,078) (1,287)
Securities collateral (252) (315)
Net amount 9 37
OTC cleared [Member]    
Derivatives [Abstract]    
Gross amounts of recognized assets 39 58
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [1] (39) (25)
Net amount   33
Exchange-traded [Member]    
Derivatives [Abstract]    
Gross amounts of recognized assets 247 311
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [1] (108) (91)
Cash collateral (133) (165)
Net amount $ 6 $ 55
[1] Represents the amount of assets that could be offset by liabilities with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets.