Benefit Obligations (Schedule of Company's Pension and Post Retirement Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net amount recognized	$ 54		$ (58)		$ 11
Other comprehensive (income) loss, tax effect	4		26
Pension Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period	3,799		4,199
Service cost	11		34		28
Interest cost	168		154		170
Participant contributions	0		0
Plan amendments	(1)		(1)
Net actuarial (gain) loss	458	[1]	(119)	[1]
Settlements	(221)		(172)
Benefits paid	(232)	[2]	(244)	[2]
Federal subsidy on Medicare Part D	0		0
Curtailments	0		(67)
Exchange rate changes	(68)		6
Other	1		9
Projected benefit obligation as of end of period	3,915		3,799		4,199
Change in Plan Assets
Fair value of plan assets as of beginning of period	2,709		2,896
Actual return on plan assets	327		171
Employer contributions	165		59
Participant contributions	0		0
Settlements	(143)		(173)
Benefits paid	(232)	[2]	(244)	[2]
Exchange rate changes	(37)		0
Fair value of plan assets as of end of period	2,789		2,709		2,896
Funded status as of end of period	(1,126)		(1,090)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets	16		11
Current Other liabilities	(23)		(23)
Benefit obligations	(1,119)		(1,078)
Net amount recognized	(1,126)		(1,090)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	16	[3]	9	[3]
Prior service (benefit) cost	(4)	[4]	(3)	[4]
Net amount recognized	12		6
Postretirement Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation as of beginning of period	136		292
Service cost	1		2		1
Interest cost	4		9		11
Participant contributions	5		23
Plan amendments	(5)		(92)
Net actuarial (gain) loss	11	[1]	(37)	[1]
Settlements	0		(23)
Benefits paid	(61)	[2]	(43)	[2]
Federal subsidy on Medicare Part D	(2)		6
Curtailments	0		0
Exchange rate changes	(4)		(1)
Other	0		0
Projected benefit obligation as of end of period	85		136		292
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	56		43
Participant contributions	5		23
Settlements	0		(23)
Benefits paid	(61)	[2]	(43)	[2]
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	(85)		(136)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Noncurrent Other assets	0		0
Current Other liabilities	(5)		(55)
Benefit obligations	(80)		(81)
Net amount recognized	(85)		(136)
Amounts Recognized in Accumulated Other Comprehensive Income Consist of:
Net actuarial (gain) loss	0	[3]	0	[3]
Prior service (benefit) cost	3	[4]	(75)	[4]
Net amount recognized	3		(75)
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, 2014 and 2013, 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 income tax expense of $26 million as of December 31, 2014 and 2013, respectively, in the consolidated statements of equity (Note 17).