Other Income (Expenses), Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Loss on extinguishment of debt (see Note 6)	$ (29)	$ (27)
Gain (loss) on financial instruments, net (see Note 9)	48	(318)
Other pension benefits, net (see Note 21)	18	10
Gain (Loss) on Sale of Equity Investments	15	9
Other income (expenses), net	$ 52	$ (326)