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Derivative and Financial Instruments - Financial Instruments at cost, plus accrued interest (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | $ 2,487 | $ 5,079
Short-term investments, carried at cost plust accrued interest | 3,759 | 2,929
Cash [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 545 | 759
Demand Deposits [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 1,182 | 1,483
Time Deposits [Member] | Remaining maturities from 1 to 90 days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 755 | 2,030
Short-term investments, carried at cost plust accrued interest | 2,961 | 1,395
Time Deposits [Member] | Remaining maturities from 91 to 180 days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 0 | 0
Short-term investments, carried at cost plust accrued interest | 741 | 465
Time Deposits [Member] | Remaining maturities within one year [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 0 | 0
Short-term investments, carried at cost plust accrued interest | 7 | 0
Commercial Paper [Member] | Remaining maturities from 1 to 90 days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 0 | 413
Short-term investments, carried at cost plust accrued interest | 50 | 1,069
Government obligations [Member] | Remaining maturities from 1 to 90 days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 5 | 394
Short-term investments, carried at cost plust accrued interest | $ 0 | $ 0

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