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Derivative Instruments and Hedging Activities (Pre-Tax Gains (Losses) On Derivatives Designated As Hedging Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 339 | $ 402 | $ 364
Revenues | $ 17,978 | $ 15,126 | $ 16,281 | $ 14,970 | $ 16,329 | $ 16,726 | $ 16,297 | $ 15,304 | 64,355 | 64,656 | 64,341
Cost of products sold |  |  |  |  |  |  |  |  | 59,902 | 60,509 | 60,160
Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total amount recognized in earnings |  |  |  |  |  |  |  |  |  | (44) | 36
Designated As Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total amount recognized in earnings |  |  |  |  |  |  |  |  | (45) | (100) | (76)
Designated As Hedging Instrument [Member] | Interest Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest contracts effective amount recognized in earnings |  |  |  |  |  |  |  |  | (2) | 1 | 1
Total amount recognized in earnings |  |  |  |  |  |  |  |  | (2) | 1 | 1
Designated As Hedging Instrument [Member] | Cost Of Products Sold [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commodity Contracts effective amount recognized in earnings |  |  |  |  |  |  |  |  | 27 | (11) | (113)
Total amount recognized in earnings |  |  |  |  |  |  |  |  | 27 | (11) | (113)
Designated As Hedging Instrument [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest contracts effective amount recognized in earnings |  |  |  |  |  |  |  |  | (75) |  |
Commodity Contracts effective amount recognized in earnings |  |  |  |  |  |  |  |  | 7 | (44) | 36
Total amount recognized in earnings |  |  |  |  |  |  |  |  | (68) |  |
Designated As Hedging Instrument [Member] | Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest contracts effective amount recognized in earnings |  |  |  |  |  |  |  |  | 0 | (46) |
Commodity Contracts effective amount recognized in earnings |  |  |  |  |  |  |  |  | (2) |  |
Total amount recognized in earnings |  |  |  |  |  |  |  |  | $ (2) | $ (46) | $ 0

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