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Basis of Presentation (Unaudited) Accumulated Other Comprehensive Income (Loss) (Details 3) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unamortized prior service credit, net of tax expense of $13 for 2020 and $17 for 2019	$ (41)	$ (51)
Cumulative translation adjustment and other, net	(157)	(148)
Total accumulated other comprehensive loss	(116)	(97)
Unamortized prior service credit, tax expense	$ 13	$ 17

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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