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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Debt issuance costs | $ 253 | $ 236
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 1,800,000,000 | 1,800,000,000
Common stock, shares outstanding | 313,502,400 | 339,425,600

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