Commitments and Contingencies (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		8 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 5-Year Term Revolving Credit Facility [Member]	Mar. 31, 2014 Other Current Liabilities [Member]	Mar. 31, 2014 Other Noncurrent Liabilities [Member]	Mar. 31, 2014 Inventoried Costs [Member]	Mar. 31, 2014 Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Low-end of the range of reasonably possible future costs for environmental remediation sites	$ 320
High-end of the range of reasonably possible future costs for environmental remediation sites	782
Accrual for Environmental Remediation Costs	337			110	227	57	123
Stand-by letters of credit and guarantees	334
Financial Arrangements [Abstract]
Surety bonds outstanding	165
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			1,775
Line of Credit Facility, Covenant Terms			65.00%
Line of Credit Facility, Amount Outstanding			0
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income	$ 72	$ 74