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Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Gross amounts of recognized liabilities $ 243 $ 125
Derivative assets available for offset 0 0
Derivative liability 243 125
Derivative assets  available for offset (75) (21)
Collateral pledged (46) (82)
Net amount 122 22
Derivative liabilities not subject to master netting agreements 21 22
Derivatives, interest rate contracts    
Derivative [Line Items]    
Gross amounts of recognized liabilities 128 60
Derivative assets available for offset 0 0
Derivative liability 128 60
Derivative assets  available for offset (42) (7)
Collateral pledged (12) (31)
Net amount 74 22
Forward contracts    
Derivative [Line Items]    
Gross amounts of recognized liabilities 115 65
Derivative assets available for offset 0 0
Derivative liability 115 65
Derivative assets  available for offset (33) (14)
Collateral pledged (34) (51)
Net amount $ 48 $ 0