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Roll-forward of Common Stock, Additional Paid-in Capital, and Retained Earnings Accounts (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Stockholders Equity Note [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 405 |
Net income attributable to common shareowners | $ 1,264 | $ 1,270 | 3,806 | $ 3,670
Balance at end of period | 1,509 |  | $ 1,509 |
Common stock, cash paid for dividends, per share |  |  | $ 2.49 | $ 2.34
Class A common stock |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 2 | $ 2
Balance at beginning of period, shares |  |  | 180 | 194
Common stock purchases |  |  | $ 0 | $ 0
Common stock purchases, shares |  |  | (3) | (4)
Stock award plans |  |  | $ 0 | $ 0
Stock award plans, shares |  |  | 4 | 5
Common stock issuances |  |  | $ 0 | $ 0
Common stock issuances, shares |  |  | 2 | 2
Conversions of class A to class B common stock |  |  | $ 0 | $ 0
Conversions of Class A to Class B common stock, shares |  |  | (7) | (12)
Balance at end of period | $ 2 | $ 2 | $ 2 | $ 2
Balance at end of period, shares | 176 | 185 | 176 | 185
Class B common stock |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 7 | $ 7
Balance at beginning of period, shares |  |  | 689 | 693
Common stock purchases |  |  | $ 0 | $ 0
Common stock purchases, shares |  |  | (9) | (16)
Conversions of class A to class B common stock |  |  | $ 0 | $ 0
Conversions of Class A to Class B common stock, shares |  |  | (7) | (12)
Balance at end of period | $ 7 | $ 7 | $ 7 | $ 7
Balance at end of period, shares | 687 | 689 | 687 | 689
Additional Paid-in Capital |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 0 | $ 0
Common stock purchases |  |  | (604) | (811)
Stock award plans |  |  | 283 | 423
Common stock issuances |  |  | 268 | 233
Option premiums received (paid) |  |  | 53 | 155
Balance at end of period | $ 0 | $ 0 | 0 | 0
Retained Earnings |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 4,879 | 6,001
Common stock purchases |  |  | (748) | (1,193)
Net income attributable to common shareowners |  |  | 3,806 | 3,670
Balance at end of period | $ 5,724 | $ 6,385 | 5,724 | 6,385
Dividends ($2.49 and $2.34 per share) |  |  | $ (2,213) | $ (2,093)

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