Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Current assets: | ||
| Allowance for bad debt | $ 738 | $ 725 |
| Accumulated depreciation | $ 13,182 | $ 12,249 |
| Shareholders’ equity: | ||
| Common stock, par value (in dollars per share) | $ 2.50 | $ 2.50 |
| Common stock, shares authorized (in shares) | 2,000 | 2,000 |
| Common stock, shares issued (in shares) | 1,069 | 1,069 |
| Treasury shares (in shares) | 198 | 196 |