Other Expenses, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Loss on extinguishment of debt (see Note 6)	$ (69)	$ (58)	$ (144)	$ (121)
Gain (loss) on financial instruments, net (see Note 9)	(64)	69	(107)	(185)
Net periodic pension benefits (costs) (see Note 21)	(15)	(115)	176	(94)
Income (Loss) from Equity Method Investments	(9)	(13)	(162)	(13)
Other expenses, net	$ (157)	$ (117)	$ (237)	$ (413)

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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