Goodwill and Intangible Assets Schedule of Goodwill (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended				11 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 13, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	$ 239
Goodwill, Acquired During Period							$ 27
Goodwill [Roll Forward]
Beginning Balance	0			$ 713		$ 713	2,727
Goodwill, Written off Related to Sale of Business Unit							(10)
Goodwill, Reclassification to Assets Held for Sale							(7)
Foreign currency translation						13	(107)
Ending Balance	239				$ 713	0	713	$ 2,727
Goodwill, Impairment Loss	0	$ (399)	$ (102)	(229)	(1,900)	(730)	(1,917)	0
Goodwill, Transfers						4
Western Hemisphere [Member]
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	0
Goodwill, Acquired During Period							0
Goodwill [Roll Forward]
Beginning Balance	0			494		494	1,958
Goodwill, Written off Related to Sale of Business Unit							(10)
Goodwill, Reclassification to Assets Held for Sale							(5)
Foreign currency translation						10	(69)
Ending Balance	0				494	0	494	1,958
Goodwill, Impairment Loss						(508)	(1,380)
Goodwill, Transfers						4
Eastern Hemisphere [Member]
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	239
Goodwill, Acquired During Period							27
Goodwill [Roll Forward]
Beginning Balance	0			$ 219		219	769
Goodwill, Written off Related to Sale of Business Unit							0
Goodwill, Reclassification to Assets Held for Sale							(2)
Foreign currency translation						3	(38)
Ending Balance	$ 239				$ 219	0	219	$ 769
Goodwill, Impairment Loss						(222)	$ (537)
Goodwill, Transfers						$ 0