Commitments and Contingent Liabilities (Guarantees) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Guarantor Obligations [Line Items]
Guarantee obligations	$ 498		$ 513
Customer and Supplier Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	315
Collateral assets and personal guarantees percentage	47.00%
Customer and Supplier Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	314	[1]
Guaranteed obligations, maximum term	7	[1]
Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	1	[1]
Guaranteed obligations, maximum term	4	[1]
Equity Affiliates, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	183	[2]
Guaranteed obligations, maximum term	1	[2]
Guarantee Obligations, Long Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	85
Guarantee Obligations, Long Term [Member] | Customer and Supplier Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	84	[1]
Guarantee Obligations, Long Term [Member] | Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	1	[1]
Guarantee Obligations, Long Term [Member] | Equity Affiliates, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	0	[2]
Guaranteed Obligations Short Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	413
Guaranteed Obligations Short Term [Member] | Customer and Supplier Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	230	[1]
Guaranteed Obligations Short Term [Member] | Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	0	[1]
Guaranteed Obligations Short Term [Member] | Equity Affiliates, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	$ 183	[2]

[1] Existing guarantees for customers and suppliers, as part of contractual agreements.

[2] Existing guarantees for equity affiliates' liquidity needs in normal operations.