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Financial Instruments (Derivative) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 2,403	$ 2,020
Restricted Cash and Cash Equivalents, Current	103	100
Restricted Cash and Cash Equivalents, Noncurrent	149	158
Total cash, cash equivalents, restricted cash and restricted cash equivalents presented in the consolidated statements of cash flows	2,655	2,278	$ 2,512	$ 4,455
Credit Derivative, Maximum Exposure, Undiscounted	52
Bank Time Deposits [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 200	$ 1,300