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Supplemental Disclosures (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Supplemental Cash Flow Information [Abstract] |  |  |
Non-cash issuances of common stock | $ 372 | $ 228 | $ 219
Stock-based compensation expense | $ 367 | $ 348 | $ 290

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