Segment Reporting Segment Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 483	$ (184)	$ 375	$ 299	$ (63)
Provision for (benefit from) income taxes on continuing operations	270		(67)	203	(179)
Income (loss) from continuing operations before income taxes	753	$ (251)	308	502	(242)
Depreciation and Amortization	227		237	485	452
Interest income	17		24	33	51
Interest Expense	34		88	93	169
Exchange losses - net	(32)		(1)	(59)	(116)	[1]
Non-operating benefits - net	(32)		(55)	(74)	(106)
Significant Items	(455)		(203)	(640)	(507)
Pro forma adjustments	0		786	298	1,478
Corporate Expenses	34		37	61	71
Segment operating EBITDA	1,486		1,581	2,031	2,344
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest income	(17)		(24)	(33)	(51)
Exchange losses - net	32		1	59
Significant Items	455		203	640	507
Hedging Program [Member]
Segment Reporting Information [Line Items]
Exchange losses - net	$ (49)		$ 177	$ (66)	$ (4)	[2]

[1] Includes a $(50) million foreign exchange loss for the six months ended June 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform, which is included within significant items.

[2] Includes a $(50) million foreign exchange loss for the six months ended June 30, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.