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Accounting Policies - Components of Other Income, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Non-Cash Settlement Charge of Unamortized Actuarial Loss, before Tax | $ 113 |  |
Other income, net | 98 | $ (25) | $ (27)
Accounting Standards Update 2017-07 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other components of net periodic benefit cost 1 | 79 | (30) | (27)
Net loss from investments | 19 | 5 | 0
Other income, net | $ 98 | $ (25) | $ (27)

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