Commitments and Contingencies (Unaudited) (Details 1) £ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 GBP (£)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs						$ 416,000,000	$ 385,000,000
Recorded Third-Party Environmental Recoveries, Amount						210,000,000	195,000,000
Financial Arrangements
Standby Unused Letters Of Credit and bank guarantees						210,000,000
Surety Bond Outstanding						208,000,000
Operating leases
Rental expense for operating leases, net of immaterial amounts of sublease rental income	$ 73,000,000	$ 69,000,000	$ 227,000,000	$ 228,000,000
Line of Credit Facility [Line Items]
Debt Instrument, Covenant Compliance			the company was in compliance with all covenants under its credit agreements.
Bridge Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						8,500,000,000
Debt Issuance Costs, Gross						29,800,000
Two Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Outstanding					£ 110	149,000,000
Line of Credit Facility, Maximum Borrowing Capacity					£ 120	162,000,000
Five Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Outstanding						0
Line of Credit Facility, Maximum Borrowing Capacity						1,600,000,000
Other Current Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs						144,000,000
Other Noncurrent Liabilities [Member]
Site Contingency [Line Items]
Accrual for Environmental Remediation Costs						272,000,000
Inventoried Costs [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount						75,000,000
Other Noncurrent Assets [Member]
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Amount						135,000,000
London Interbank Offered Rate (LIBOR) [Member] | Two Year Term [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate Description			1.10%
Environmental Issue [Member] | Maximum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss						796,000,000	774,000,000
Environmental Issue [Member] | Minimum
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss						$ 409,000,000	$ 379,000,000