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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Properties, accumulated depreciation | $ 11,777 | $ 11,985
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) | 246,972,217 | 252,095,082

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