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Significant Accounting Policies (Pensions) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension and other postretirement benefits |  |  |
Recognition period of investment gains or losses related to asset valuation for determining net periodic benefit cost | 5 years |  |
Conditional amortization gains or losses as percentage of greater of plan assets or liabilities, minimum | 10.00% |  |
Pension liability, current and noncurrent | $ 351 | $ 362 |
Pension asset, non-current | 42 | 47 |
Net periodic benefit costs (income) | $ (3) | $ (9) | $ 5

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- Definition Minimum threshold percentage for amortization of investment gains or losses of the greater of plan assets or plan liabilities being amortized over the average expected future service period of the employee participants. + References No definition available. + Details
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