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Retirement Benefit Plans - Funded status of plans with ABO in excess of plan assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ (633) | $ (650)
Plan assets | 425 | 450
Funded status of plan | (208) | (200)
United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | (22) | (37)
Germany |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | (107) | (95)
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | $ (79) | $ (68)

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