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Pension and Other Benefit Plans - Expected Future Contributions and Benefit Payments (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Defined Benefit Pension Plan  
Employer contributions:  
2020 $ 0
Benefit Payments:  
2020 24
2021 24
2022 24
2023 25
2024 26
2025 - 2029 140
Retiree Medical Plan  
Employer contributions:  
2020 0
Benefit Payments:  
2020 1
2021 0
2022 1
2023 0
2024 0
2025 - 2029 $ 2