Income Taxes Deferred Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets (Liabilities) [Abstract]
Depreciation and amortization				$ (3,444)	$ (3,957)
Net operating loss and credit carryforwards				1,311	1,150
Reserves and accruals				148	139
Accrued compensation				250	265
Inventory basis difference				105	81
Other capitalized costs				103	61
Unrealized losses on hedging instruments				23	125
Other, net				143	126
Deferred tax assets (liabilities), net before valuation allowance				(1,361)	(2,010)
Valuation Allowance	$ 256	$ 113	$ 109	471	256
Deferred tax assets (liabilities), net				$ (1,832)	$ (2,266)
Valuation Allowance [Roll Forward]
Beginning Balance	256	113	109
Additions charged to income tax provision	223	28
Additions due to acquisitions	17	108	25
Deductions	(15)
Increase (decrease) from currency translation and other	(10)	7	(21)
Ending Balance	$ 471	$ 256	$ 113