Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Asset Derivatives		$ 753	$ 599
Liability Derivatives		394	425
Derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Asset Derivatives		553	331
Liability Derivatives		64	255
Derivatives designated as accounting hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives		34	19
Liability Derivatives		60	190
Derivatives designated as accounting hedges | Net investment hedge derivative contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	[1]	519	312
Liability Derivatives	[1]	4	65
Derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Asset Derivatives		200	268
Liability Derivatives		330	170
Derivatives not designated as accounting hedges | Currency exchange contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives		87	67
Liability Derivatives		86	50
Derivatives not designated as accounting hedges | Commodity contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives		113	201
Liability Derivatives		$ 244	$ 120

[1] Net investment hedge derivative 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 8, 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.