Income Taxes Deferred Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets (Liabilities) [Abstract]
Depreciation and amortization				$ (3,084)	$ (3,444)
Net operating loss and credit carryforwards				1,231	1,311
Reserves and accruals				144	148
Accrued compensation				261	250
Inventory basis difference				99	105
Other capitalized costs				71	103
Unrealized losses on hedging instruments				10	23
Other, net				57	143
Deferred tax assets (liabilities), net before valuation allowance				(1,211)	(1,361)
Valuation Allowance	$ 408	$ 256	$ 113	408	471
Deferred tax assets (liabilities), net				$ (1,619)	$ (1,832)
Valuation Allowance [Roll Forward]
Beginning Balance	471	256	113
(Reductions) additions charged to income tax provision, net	(27)	223	28
Additions due to acquisitions		17	108
Reduction due to a divestiture	(33)
Deductions		(15)
Currency translation and other	(3)	(10)	7
Ending Balance	$ 408	$ 471	$ 256