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Retirement Plans and Post Retirement Benefits Level 3 Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | $ 275 | $ 266 |
Fair value of plan assets, end of year balance | 275 | 266 | $ 294
Multi-strategy Funds |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 53 |  |
Fair value of plan assets, end of year balance | 53 |  | 53
Significant Unobservable Inputs (Level 3) |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 |  | 0
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 0 |  |
Fair value of plan assets, end of year balance | 0 |  | 0
Net Asset Value, previously Level 3 [Member] | Multi-strategy Funds |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |
Fair value of plan assets, beginning of year balance | 13 | 13 |
Total unrealized gains (losses) |  | 0 |
Defined Benefit Plan, Redemptions | (13) | 0 |
Defined Benefit Plan, Mangement Fees |  | 0 |
Fair value of plan assets, end of year balance | $ 13 | $ 13 | $ 0

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