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Long-Term Debt - FHLB Advances (Details) - Subsidiaries - FHLB Advances Due 2021 to 2047
$ in Millions
Dec. 31, 2020
USD ($)
Debt Instrument  
Residential mortgage loans and securities serving as FHLB collateral $ 16,700
FHLB advances 67
FHLB maturing in 2021 1
FHLB maturing in 2022 1
FHLB maturing in 2023 51
FHLB maturing in 2024 0
FHLB maturing in 2025 5
FHLB maturing thereafter $ 9
Lower limit  
Debt Instrument  
Interest rate 0.05%
Upper Limit  
Debt Instrument  
Interest rate 5.91%