Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions |
Sep. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Allowance for doubtful accounts | $ 147 | $ 129 |
| Current portion of debt, fair value | $ 1,682 | $ 1,557 |
| Common Class A | ||
| Common stock, par or stated value per share | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 4,000,000,000 | 4,000,000,000 |
| Common stock, shares issued | 387,810,463 | 386,691,461 |
| Common stock, shares outstanding | 387,810,463 | 386,691,461 |
| Common Class B | ||
| Common stock, par or stated value per share | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 150,000,000 | 150,000,000 |
| Common stock, shares issued | 29,376,619 | 29,278,424 |
| Common stock, shares outstanding | 29,376,619 | 29,278,424 |
| Common Class C | ||
| Common stock, par or stated value per share | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 400,000,000 | 400,000,000 |
| Common stock, shares issued | 0 | 0 |