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Goodwill & Other Intangible Assets - Expected Future Amortization Expense (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Value of in-force contracts [1]  
Finite-Lived Intangible Assets [Line Items]  
2021 $ 21
2022 10
2023 0
2024 0
2025 0
Other Intangible Assets [Member]  
Finite-Lived Intangible Assets [Line Items]  
2021 71
2022 70
2023 70
2024 70
2025 $ 70