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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 53
Unrecognized tax benefits that would impact effective tax rate	$ 35		$ 263	$ 97
Undistributed earnings of foreign subsidiaries	2,500
Foreign earnings repatriated	424
Receivable, Current, Disputed Tax Deposit	33
Decrease in tax liability	378
National Tax Service of Korea [Member]
Income Taxes [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
Minimum [Member]
Income Taxes [Line Items]
Foreign Statutes of Limitations Period	3 years
Maximum [Member]
Income Taxes [Line Items]
Foreign Statutes of Limitations Period	10 years