Benefit Obligations (Schedule of Company's Pension and Post Retirement Benefit Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net amount recognized		$ (3)	$ 54	$ (58)
Other comprehensive (income) loss, tax effect		3	4
Pension Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		3,915	3,799
Service cost		12	11	34
Interest cost		139	168	154
Participant contributions		0	0
Plan amendments		0	(1)
Net actuarial (gain) loss	[1]	(141)	458
Settlements		0	(221)
Benefits paid	[2]	(234)	(232)
Federal subsidy on Medicare Part D		0	0
Curtailments		(1)	0
Special termination benefits		2	0
Exchange rate changes		(65)	(68)
Other		8	1
Projected benefit obligation as of end of period		3,635	3,915	3,799
Change in Plan Assets
Fair value of plan assets as of beginning of period		2,789	2,709
Actual return on plan assets		(67)	327
Employer contributions		59	165
Participant contributions		0	0
Settlements		0	(143)
Benefits paid	[2]	(234)	(232)
Exchange rate changes		(39)	(37)
Fair value of plan assets as of end of period		2,508	2,789	2,709
Funded status as of end of period		(1,127)	(1,126)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		16	16
Current Other liabilities		(25)	(23)
Benefit obligations		(1,118)	(1,119)
Net amount recognized		(1,127)	(1,126)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[3]	16	16
Prior service (benefit) cost		(1)	(4)
Net amount recognized	[4]	15	12
Postretirement Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period		85	136
Service cost		1	1	2
Interest cost		3	4	9
Participant contributions		1	5
Plan amendments		(6)	(5)
Net actuarial (gain) loss	[1]	(8)	11
Settlements		0	0
Benefits paid	[2]	(5)	(61)
Federal subsidy on Medicare Part D		0	(2)
Curtailments		0	0
Special termination benefits		0	0
Exchange rate changes		(5)	(4)
Other		0	0
Projected benefit obligation as of end of period		66	85	136
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	56
Participant contributions		1	5
Settlements		0	0
Benefits paid	[2]	(5)	(61)
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)	(85)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets		0	0
Current Other liabilities		(4)	(5)
Benefit obligations		(62)	(80)
Net amount recognized		(66)	(85)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	[3]	0	0
Prior service (benefit) cost		(4)	3
Net amount recognized	[4]	(4)	3
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, 2015 and 2014, respectively.

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

[4] Amount shown net of an income tax benefit of $3 million and $4 million as of December 31, 2015 and 2014, respectively, in the consolidated statements of equity (Note 17).