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Pension and Other Postretirement Benefit Plans (Obligations and Funded Status at End of Year) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Postretirement Benefits
Funded status
Fair value of plan assets	$ 0	$ 0	$ 0
Benefit obligations	355	356	394
Funded status	(355)	(356)
Amounts recognized in the consolidated balance sheets
Noncurrent asset	0	0
Current liability	(33)	(38)
Noncurrent liability	(322)	(318)
Amount recognized	(355)	(356)
Amounts recognized in accumulated other comprehensive loss (pre-tax)
Net actuarial loss	15	1
Prior service (credit) cost	(16)	(16)
Amount recognized	(1)	(15)
United States Pension Benefits | Pension Benefits
Funded status
Fair value of plan assets	2,934	2,676	2,746
Benefit obligations	3,141	3,033	3,415
Funded status	(207)	(357)
Amounts recognized in the consolidated balance sheets
Noncurrent asset	0	0
Current liability	(6)	(38)
Noncurrent liability	(201)	(319)
Amount recognized	(207)	(357)
Amounts recognized in accumulated other comprehensive loss (pre-tax)
Net actuarial loss	1,329	1,445
Prior service (credit) cost	1	(1)
Amount recognized	1,330	1,444
Foreign Pension Benefits | Pension Benefits
Funded status
Fair value of plan assets	593	518	571
Benefit obligations	941	834	$ 952
Funded status	(348)	(316)
Amounts recognized in the consolidated balance sheets
Noncurrent asset	11	12
Current liability	(17)	(10)
Noncurrent liability	(342)	(318)
Amount recognized	(348)	(316)
Amounts recognized in accumulated other comprehensive loss (pre-tax)
Net actuarial loss	234	192
Prior service (credit) cost	4	(2)
Amount recognized	$ 238	$ 190

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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