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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Tax loss carryforwards and credits | $ 1,570 | $ 1,159
Prepaid royalty income | 629 | 576
Capitalized research and development expenditures | 421 | 416
Accrued expenses deductible as paid | 255 | 347
Postretirement benefits and pensions | 209 | 221
Lease liabilities | 76 | 75
Rationalizations and other provisions | 34 | 38
Vacation and sick pay | 21 | 23
Other | 133 | 106
Total gross deferred tax assets | 3,348 | 2,961
Valuation allowance | (1,469) | (982)
Total deferred tax assets | 1,879 | 1,979
Property basis differences | (420) | (467)
Right-of-use assets | (75) | (74)
Tax on undistributed earnings of subsidiaries | (1) | (1)
Total net deferred tax assets | $ 1,383 | $ 1,437

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