Other Assets and Other Liabilities (Other Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Other Assets and Other Liabilities [Abstract]
Derivative instruments (Note 15)		$ 157	$ 103
South Korean tax deposits		33
Other current assets		683	599
Other current assets		873	702
Derivative instruments		92	45
South Korean tax deposits		415	425
Operating leases (Note 4)	[1]	504
Other non-current assets		476	551
Other assets		$ 1,487	$ 1,021

[1] Included in other assets.