Benefit Obligations (Schedule of Company's Pension and Post Retirement Benefit Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net amount recognized		$ (9)	$ 4	$ (3)
Other comprehensive (income) loss, tax effect		6	4
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid	[1]	(233)	(232)
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		3,610	3,635
Service cost		9	8	12
Interest cost		107	113	139
Participant contributions		0	0
Plan amendments		0	0
Net actuarial (gain) loss	[2]	151	102
Defined Benefit Plan, Benefit Obligation, Divestiture		0	0
Settlements		(1)	(1)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(233)	(232)
Federal subsidy on Medicare Part D		0	0
Curtailments		0	0
Special termination benefits		1	3
Exchange rate changes		69	(18)
Other	[3]	15	0
Projected benefit obligation as of end of period		3,728	3,610	3,635
Change in Plan Assets
Fair value of plan assets as of beginning of period		2,784	2,508
Actual return on plan assets		302	177
Employer contributions		359	346
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		0	0
Settlements		(1)	(1)
Exchange rate changes		40	(14)
Fair value of plan assets as of end of period		3,251	2,784	2,508
Funded status as of end of period		(477)	(826)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		64	22
Current Other liabilities		(24)	(25)
Benefit obligations		(517)	(823)
Net amount recognized		(477)	(826)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[4]	9	18
Prior service (benefit) cost		(1)	(1)
Net amount recognized	[5]	8	17
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid	[1]	(4)	(4)
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		67	66
Service cost		1	0	1
Interest cost		1	2	3
Participant contributions		0	0
Plan amendments		0	0
Net actuarial (gain) loss	[2]	(2)	3
Defined Benefit Plan, Benefit Obligation, Divestiture		0	0
Settlements		0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(4)	(4)
Federal subsidy on Medicare Part D		0	0
Curtailments		0	0
Special termination benefits		0	0
Exchange rate changes		3	0
Other	[3]	0	0
Projected benefit obligation as of end of period		66	67	66
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
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		0	0
Settlements		0	0
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		(66)	(67)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		0	0
Current Other liabilities		(5)	(5)
Benefit obligations		(61)	(62)
Net amount recognized		(66)	(67)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[4]	0	0
Prior service (benefit) cost		1	(1)
Net amount recognized	[5]	1	(1)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		$ (22)	$ (22)

[1] Includes benefit payments to nonqualified pension plans of $22 million and $22 million as of December 31, 2017 and 2016, respectively.

[2] Primarily relates to change in discount rates.

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

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

[5] Amount shown net of an income tax benefit of $6 million and $4 million as of December 31, 2017 and 2016, respectively, in the consolidated statements of equity (Note 17).