Commitments and Contingent Liabilities (Guarantees) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Guarantor Obligations [Line Items]
Guarantee obligations	$ 513
Guaranteed Obligations, Short-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	411
Guarantee Obligations, Long-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	102
Customer and Supplier Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	326	[1]
Guaranteed obligations maximum term	7	[1]
Customer and Supplier Guarantee, Bank Borrowings [Member] | Guaranteed Obligations, Short-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	226	[1]
Customer and Supplier Guarantee, Bank Borrowings [Member] | Guarantee Obligations, Long-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	100	[1]
Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	2	[1]
Guaranteed obligations maximum term	4	[1]
Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member] | Guaranteed Obligations, Short-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	0	[1]
Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member] | Guarantee Obligations, Long-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	2	[1]
Equity Affiliates Guarantee, Bank Borrowings [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	185	[2]
Guaranteed obligations maximum term	1	[2]
Equity Affiliates Guarantee, Bank Borrowings [Member] | Guaranteed Obligations, Short-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	185	[2]
Equity Affiliates Guarantee, Bank Borrowings [Member] | Guarantee Obligations, Long-Term [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	0	[2]
Customer and Supplier Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantee obligations	$ 328
Collateral assets and personal guarantees percentage	35.00%

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

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