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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Debt issuance costs | $ 239 | $ 157
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 1,800,000,000 | 1,800,000,000
Common stock, shares outstanding | 338,445,600 | 342,895,200

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