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Income Taxes Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 45 | $ 124
Tax credit carryforwards | 27 | 26
Accrued liabilities and deferred income | 91 | 88
Operating leases | 147 | 151
Minimum pension obligations | 15 | 19
Provision for doubtful accounts | 9 | 9
Liability for unrecognized tax benefits | 1 | 1
Interest rate swaps | 12 | 21
Other | 2 | 0
Total deferred tax assets | 349 | 439
Less: valuation allowance | (20) | (21)
Total deferred income tax assets after valuation allowance | 329 | 418
Deferred income tax liabilities: |  |
Depreciation and amortization | 546 | 553
Operating leases | 119 | 119
Prepaid expenses | 9 | 9
Basis difference in investment in joint ventures | 7 | 11
Other | 1 | 1
Total deferred tax liabilities | 682 | 693
Deferred Tax Assets, Net, Classification [Abstract] |  |
Net deferred income tax liabilities | (353) | (275)
Deferred income taxes | $ 353 | 276
Deferred Tax Assets, Net |  | $ 1

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