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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Statement of Financial Position [Abstract] |  |
Properties, accumulated depreciation | $ 12,267 | $ 12,031
Common stock, par or stated value per share (in dollars per share) | $ 1.00 | $ 1.00
Common stock, shares authorized (in shares) | 1,350,000,000 | 1,350,000,000
Common stock, shares outstanding, net of treasury shares (in shares) | 234,873,651 | 240,162,790

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