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Employee Benefit Arrangements - Expected Future Contributions and Benefit Payments (Details) - Pension Plan
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 125
2021 122
2022 126
2023 130
2024 130
2025-2029 682
Nonqualified pension plan  
Defined Benefit Plan Disclosure [Line Items]  
Estimated future employer contributions next year $ 86