Benefit Obligations (Schedule of Company's Pension and Post Retirement Benefit Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net amount recognized		$ 0	$ (9)	$ 4
Other comprehensive (income) loss, tax effect		5	6
Pension Plan [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		3,728	3,610
Service cost		9	9	8
Interest cost		104	107	113
Net actuarial (gain) loss	[1]	(163)	151
Settlements		0	(1)
Benefits paid		(235)	(233)
Curtailments		(1)	0
Special termination benefits		2	1
Exchange rate changes		(32)	69
Other	[2]	0	15
Projected benefit obligation as of end of period		3,412	3,728	3,610
Change in Plan Assets
Fair value of plan assets as of beginning of period		3,251	2,784
Actual return on plan assets		(124)	302
Employer contributions		43	359
Settlements		0	(1)
Benefits paid	[3]	(235)	(233)
Exchange rate changes		(20)	40
Fair value of plan assets as of end of period		2,915	3,251	2,784
Funded status as of end of period		(497)	(477)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		30	64
Current Other liabilities		(24)	(24)
Benefit obligations		(503)	(517)
Funded status as of end of period		(497)	(477)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[4]	8	9
Prior service (benefit) cost		0	(1)
Net amount recognized	[5]	8	8
Other Postretirement Benefits Plan [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		66	67
Service cost		1	1	0
Interest cost		2	1	2
Net actuarial (gain) loss	[1]	(4)	(2)
Settlements		0	0
Benefits paid		(4)	(4)
Curtailments		0	0
Special termination benefits		0	0
Exchange rate changes		(2)	3
Other	[2]	0	0
Projected benefit obligation as of end of period		59	66	67
Change in Plan Assets
Fair value of plan assets as of beginning of period		0	0
Actual return on plan assets		0	0
Employer contributions		4	4
Settlements		0	0
Benefits paid	[3]	(4)	(4)
Exchange rate changes		0	0
Fair value of plan assets as of end of period		0	0	$ 0
Funded status as of end of period		(59)	(66)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		0	0
Current Other liabilities		(5)	(5)
Benefit obligations		(54)	(61)
Funded status as of end of period		(59)	(66)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[4]	0	0
Prior service (benefit) cost		0	1
Net amount recognized	[5]	0	1
Supplemental Employee Retirement Plan [Member]
Change in Plan Assets
Benefits paid		$ (22)	$ (22)

[1] Primarily relates to change in discount rates.

[2] Primarily relates to the acquisition of Nilit (Note 4).

[3] Includes benefit payments to nonqualified pension plans of $22 million and $22 million as of December 31, 2018 and 2017, respectively.

[4] Relates to the pension plans of the Company's equity method investments.

[5] Amount shown net of an income tax benefit of $5 million and $6 million as of December 31, 2018 and 2017, respectively, in the consolidated statements of equity (Note 17).