Stock-Based and Other Compensation Plans Stock-Based and Other Compensation Plans (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	$ 242
Noncurrent Liabilities	(24)	(155)
Net Prior Service (Cost) Credit, Before Tax	(82)
Accumulated Other Comprehensive Loss	(90)	(117)	(113)	(100)
Defined Benefit Plan, Net Periodic Benefit Cost	11	37	27
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	21
Defined Benefit Plan, Curtailments	20
Defined Benefit Plan, Description of Settlements and Curtailments	10
Retirement and Restoration Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension or Other Benefit Obligation	(363)	(394)
Fair Value of Plan Assets	242	265
Net Amount Recognized in Consolidated Balance Sheet	(121)	(129)
Defined Benefit Pension Plan Liabilities, Current	(102)	(6)
Noncurrent Liabilities	(19)	(123)
Net Prior Service (Cost) Credit, Before Tax	(75)	(88)
Net Gains (Losses), Before Tax	42	56
Accumulated Other Comprehensive Loss	(117)	(144)
Medical and Life Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension or Other Benefit Obligation	(7)	(36)
Fair Value of Plan Assets	0	0
Net Amount Recognized in Consolidated Balance Sheet	(7)	(36)
Defined Benefit Pension Plan Liabilities, Current	(2)	(2)
Noncurrent Liabilities	(5)	(34)
Net Prior Service (Cost) Credit, Before Tax	2	6
Net Gains (Losses), Before Tax	0	15
Accumulated Other Comprehensive Loss	$ 2	$ (9)