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Financial Instruments (Pre-tax Unrealized Gains (Losses)) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Derivative [Line Items] |  |
Unrealized gain (loss) on derivatives | $ 110 | $ (137)
Fixed-price Preemptive Rights [Member] |  |
Derivative [Line Items] |  |
Unrealized gain (loss) on derivatives | 14 | (35)
Cronos Warrant [Member] |  |
Derivative [Line Items] |  |
Unrealized gain (loss) on derivatives | $ 96 | $ (102)

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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