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Supplemental Disclosures (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplemental Cash Flow Information [Abstract] |  |  |
Non-cash issuances of common stock | $ 228 | $ 219 | $ 165
Stock-based compensation expense | $ 348 | $ 290 | $ 252

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