Goodwill and Intangible Assets Narrative (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	Dec. 12, 2019
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	$ 239
Goodwill, Impaired, Accumulated Impairment Loss									$ 3,400
Goodwill, Impairment Loss	0	$ 399	$ 102	$ 229	$ 1,900	$ 730	$ 1,917	$ 0
Eastern Hemisphere [Member]
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	239
Goodwill, Impairment Loss						222	537
Western Hemisphere [Member]
Goodwill [Line Items]
Goodwill, Period Increase (Decrease)	$ 0
Goodwill, Impairment Loss						$ 508	$ 1,380