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Financial Instruments - Credit Losses (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 176,113		$ 174,945
Allowance for credit loss	918
Trade receivable	8,600
Non-trade receivable	$ 3,700
ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 25