Commitments and Contingencies (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		14 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 5-Year Term Revolving Credit Facility [Member]	Sep. 30, 2014 Other Current Liabilities [Member]	Sep. 30, 2014 Other Noncurrent Liabilities [Member]	Sep. 30, 2014 Inventoried Costs [Member]	Sep. 30, 2014 Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 363		$ 363
High-end of the range of reasonably possible future costs for environmental remediation sites	798		798
Accrual for Environmental Remediation Costs	381		381			135	246	69	124
Financial Arrangements [Abstract]
Surety bonds outstanding	158		158
Stand-by letters of credit and guarantees	298		298
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					1,775
Credit Facility, Covenant Terms, Maximum Debt to Capitalization Ratio					65.00%
Line of Credit Facility, Amount Outstanding					0
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income	$ 84	$ 75	$ 229	$ 223