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Income Taxes Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 124 | $ 177
Tax credit carryforwards | 26 | 29
Accrued liabilities and deferred income | 88 | 77
Operating leases | 151 | 169
Minimum pension obligations | 19 | 18
Provision for doubtful accounts | 9 | 7
Liability for unrecognized tax benefits | 1 | 1
Interest rate swaps | 21 | 12
Total deferred tax assets | 439 | 490
Less: valuation allowance | (21) | (17)
Total deferred income tax assets after valuation allowance | 418 | 473
Deferred income tax liabilities: |  |
Depreciation and amortization | 553 | 704
Operating leases | 119 | 146
Prepaid expenses | 9 | 8
Basis difference in investment in joint ventures | 11 | 2
Other | 1 | 2
Total deferred tax liabilities | 693 | 862
Deferred Tax Assets, Net, Classification [Abstract] |  |
Net deferred income tax liabilities | (275) | (389)
Deferred Income Tax Liabilities, Net | 276 | $ 390
Deferred Tax Assets, Net | 1 |
Operating Loss Carryforwards | $ 368 |

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