Benefit Obligations (Schedule of Company's Pension and Post Retirement Benefit Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net amount recognized		$ 4	$ (3)	$ 54
Other comprehensive (income) loss, tax effect		4	3
Pension Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		3,635	3,915
Service cost		8	12	11
Interest cost		113	139	168
Participant contributions		0	0
Plan amendments		0	0
Net actuarial (gain) loss	[1]	102	(141)
Settlements		(1)	0
Benefits paid	[2]	(232)	(234)
Federal subsidy on Medicare Part D		0	0
Curtailments		0	(1)
Special termination benefits		3	2
Exchange rate changes		(18)	(65)
Other		0	8
Projected benefit obligation as of end of period		3,610	3,635	3,915
Change in Plan Assets
Fair value of plan assets as of beginning of period		2,508	2,789
Actual return on plan assets		177	(67)
Employer contributions		346	59
Participant contributions		0	0
Settlements		(1)	0
Benefits paid	[2]	(232)	(234)
Exchange rate changes		(14)	(39)
Fair value of plan assets as of end of period		2,784	2,508	2,789
Funded status as of end of period		(826)	(1,127)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		22	16
Current Other liabilities		(25)	(25)
Benefit obligations		(823)	(1,118)
Net amount recognized		(826)	(1,127)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[3]	18	16
Prior service (benefit) cost		(1)	(1)
Net amount recognized	[4]	17	15
Postretirement Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		66	85
Service cost		0	1	1
Interest cost		2	3	4
Participant contributions		0	1
Plan amendments		0	(6)
Net actuarial (gain) loss	[1]	3	(8)
Settlements		0	0
Benefits paid	[2]	(4)	(5)
Federal subsidy on Medicare Part D		0	0
Curtailments		0	0
Special termination benefits		0	0
Exchange rate changes		0	(5)
Other		0	0
Projected benefit obligation as of end of period		67	66	85
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
Participant contributions		0	1
Settlements		0	0
Benefits paid	[2]	(4)	(5)
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		(67)	(66)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		0	0
Current Other liabilities		(5)	(4)
Benefit obligations		(62)	(62)
Net amount recognized		(67)	(66)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[3]	0	0
Prior service (benefit) cost		(1)	(4)
Net amount recognized	[4]	(1)	(4)
Nonqualified Pension Benefits [Member]
Change in Projected Benefit Obligation
Benefits paid		(22)	(22)
Change in Plan Assets
Benefits paid		$ (22)	$ (22)

[1] Primarily relates to change in discount rates.

[2] Includes benefit payments to nonqualified pension plans of $22 million and $22 million as of December 31, 2016 and 2015, respectively.

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

[4] Amount shown net of an income tax benefit of $4 million and $3 million as of December 31, 2016 and 2015, respectively, in the consolidated statements of equity (Note 17).