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Income Taxes (Components of Net Deferred Tax Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Net operating loss and other loss carryforwards | $ 2,017 | $ 1,926
Nondeductible accruals and other | 2,779 | 2,656
Less: Valuation allowance | 1,906 | 632
Total deferred tax assets, net of valuation allowance | 2,890 | 3,950
Deferred Tax Liabilities: |  |
Differences between book and tax basis of property and equipment and intangible assets | 29,387 | 29,139
Differences between book and tax basis of investments | 702 | 491
Differences between book and tax basis of long-term debt | 751 | 604
Differences between book and tax basis of foreign subsidiaries and undistributed foreign earnings | 143 | 85
Total deferred tax liabilities | 30,983 | 30,319
Net deferred tax liability | $ 28,093 | $ 26,369

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