Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax loss carryforwards and credits	$ 1,159	$ 1,473
Prepaid royalty income	576	0
Capitalized research and development expenditures	416	404
Accrued expenses deductible as paid	347	261
Postretirement benefits and pensions	221	207
Rationalizations and other provisions	38	26
Vacation and sick pay	23	23
Deferred interest deductions	0	40
Other	106	111
Total gross deferred tax assets	2,886	2,545
Valuation allowance	(982)	(317)
Total deferred tax assets	1,904	2,228
Property basis differences	(466)	(475)
Tax on undistributed earnings of subsidiaries	(1)	(1)
Total net deferred tax assets	$ 1,437	$ 1,752