Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Asset Derivatives		$ 599	$ 617
Liability Derivatives		425	630
Derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Asset Derivatives		331	354
Liability Derivatives		255	383
Derivatives designated as accounting hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives		19	17
Liability Derivatives		190	355
Derivatives designated as accounting hedges | Net investment hedge contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	[1]	312	337
Liability Derivatives	[1]	65	28
Derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Asset Derivatives		268	263
Liability Derivatives		170	247
Derivatives not designated as accounting hedges | Currency exchange contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives		67	72
Liability Derivatives		50	37
Derivatives not designated as accounting hedges | Commodity contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives		201	191
Liability Derivatives		$ 120	$ 210

[1] Net investment hedge contracts consist of cross-currency interest rate swaps and forward contracts. We also designate some of our non-U.S. dollar denominated debt to hedge a portion of our net investments in our non-U.S. operations. This debt is not reflected in the table above, but is included in long-term debt discussed in Note 9, Debt and Borrowing Arrangements. Both net investment hedge derivative contracts and non-U.S. dollar denominated debt acting as net investment hedges are also disclosed in the Derivative Volume table and the Hedges of Net Investments in International Operations section appearing later in this footnote.