Other Assets and Other Liabilities (Narrative) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Other Assets And Liabilities [Line Items]
Receivable, Current, Disputed Tax Deposit	$ 33
National Tax Service of Korea [Member]
Other Assets And Liabilities [Line Items]
Receivable, Noncurrent, Disputed Tax Deposit	415
Receivable, Current, Disputed Tax Deposit	33
Income tax expected refund as result of agreement with tax authority	$ 38

The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

Name:	us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant