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v3.10.0.1

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 | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders Equity Note [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  | $ 994 |  |  |
Net income attributable to common shareowners | $ 1,485 | $ 1,384 | 2,830 | $ 2,550 |  |
Balance at end of period | 2,328 |  | $ 2,328 |  |  |
Common stock, cash paid for dividends, per share |  |  | $ 1.82 | $ 1.66 |  |
Class A common stock |  |  |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  | $ 2 | $ 2 |  |
Balance at beginning of period, shares |  |  | 173 | 180 |  |
Common stock purchases |  |  | $ 0 | $ 0 |  |
Common stock purchases, shares |  |  | (2) | (2) |  |
Stock award plans |  |  | $ 0 | $ 0 |  |
Stock award plans, shares |  |  | 3 | 4 |  |
Common stock issuances |  |  | $ 0 | $ 0 |  |
Common stock issuances, shares |  |  | 2 | 1 |  |
Conversions of class A to class B common stock |  |  | $ 0 | $ 0 |  |
Conversions of Class A to Class B common stock, shares |  |  | (8) | (5) |  |
Balance at end of period | $ 2 | $ 2 | $ 2 | $ 2 |  |
Balance at end of period, shares | 168 | 178 | 168 | 178 |  |
Class B common stock |  |  |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  | $ 7 | $ 7 |  |
Balance at beginning of period, shares |  |  | 687 | 689 |  |
Common stock purchases |  |  | $ 0 | $ 0 |  |
Common stock purchases, shares |  |  | (2) | (6) |  |
Conversions of class A to class B common stock |  |  | $ 0 | $ 0 |  |
Conversions of Class A to Class B common stock, shares |  |  | (8) | (5) |  |
Balance at end of period | $ 7 | $ 7 | $ 7 | $ 7 |  |
Balance at end of period, shares | 693 | 688 | 693 | 688 |  |
Additional Paid-in Capital |  |  |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  | $ 0 | $ 0 |  |
Common stock purchases |  |  | (383) | (412) |  |
Stock award plans |  |  | 170 | 157 |  |
Common stock issuances |  |  | 232 | 203 |  |
Option premiums received (paid) |  |  | (19) | 52 |  |
Balance at end of period | $ 0 | $ 0 | 0 | 0 |  |
Retained Earnings |  |  |  |  |  |
Stockholders Equity Note [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  | 5,852 | 4,880 |  |
Common stock purchases |  |  | (128) | (489) |  |
Net income attributable to common shareowners |  |  | 2,830 | 2,550 |  |
Balance at end of period | $ 7,665 | $ 5,446 | 7,665 | 5,446 |  |
Dividends ($0.91 and $0.83 per share) |  |  | $ (1,624) | $ (1,495) |  |
Reclassification from AOCI pursuant to the early adoption of ASU 2018-02 |  |  |  |  | $ 735 | $ 0

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