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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Deferred tax assets: |  |
Net operating loss and capital loss carryforwards, state | $ 38 | $ 72
Net operating loss and capital loss carryforwards, foreign | 122 | 122
Retirement and other employee benefits | 51 | 69
State tax credits | 29 | 69
Other | 43 | 23
Operating lease liabilities | 62 | 61
Gross deferred tax assets | 345 | 416
Valuation allowance | (150) | (157)
Net deferred tax assets | 195 | 259
Deferred tax liabilities: |  |
Depreciation and amortization | (157) | (204)
Investments in partnerships | (998) | (1,173)
Operating lease right-of-use assets | (60) | (60)
Other | (9) | (6)
Deferred tax liabilities | (1,224) | (1,443)
Net deferred tax liability | (1,029) | (1,184)
Unrecognized tax benefits: |  |
Balance as of January 1 | 81 | 104
Additions for tax positions taken during the current year | 0 | 0
Additions for tax positions taken during prior years | 5 | 0
Reductions related to lapsed statutes of limitations | 0 | 0
Reductions related to settlements with tax jurisdictions | (59) | (23)
Balance as of December 31 | $ 27 | $ 81

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