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Derivative and Financial Instruments - Financial Instruments Cost (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | $ 5,079 | $ 5,915
Short-term investments carried at cost plust accrued interest | 2,929 | 248
Cash [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 759 | 876
Demand Deposits [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 1,483 | 0
Short-term investments carried at cost plust accrued interest | 0 | 0
Bank Time Deposits [Member] | Remaining Maturities 1 To 90 Days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 2,030 | 3,509
Short-term investments carried at cost plust accrued interest | 1,395 | 0
Bank 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 | 465 | 0
Commercial Paper [Member] | Remaining Maturities 1 To 90 Days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 413 | 229
Short-term investments carried at cost plust accrued interest | 1,069 | 248
US Government Debt Securities [Member] | Remaining Maturities 1 To 90 Days [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Cash and Cash Equivalents, carried at cost plus accrued interest | 394 | 1,301
Short-term investments carried at cost plust accrued interest | $ 0 | $ 0

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