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Shareowners' Equity and Noncontrolling Interest (Summary of Changes in Shareowners' Equity and Noncontrolling Interest) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Shareowners' Equity, beginning of period | $ 30,534 | $ 27,594 | $ 29,610 | $ 27,579
Noncontrolling interest, beginning of period | 1,958 | 1,678 | 1,811 | 1,590
Total Equity, beginning of period | 32,492 | 29,272 | 31,421 | 29,169
Net income, Shareowners' Equity | 2,048 | 1,439 | 3,345 | 2,825
Net Income, Noncontrolling Interest | 91 | 93 | 162 | 175
Net income, Total Equity | 2,139 | 1,532 | 3,507 | 3,000
Total other comprehensive income (loss), Shareowners' Equity | (747) | 369 | (159) | 370
Total other comprehensive income (loss), Noncontrolling Interest | (38) | 18 | (5) | 43
Total other comprehensive income (loss) | (785) | 387 | (164) | 413
Total comprehensive income for the period, Shareowners' Equity | 1,301 | 1,808 | 3,186 | 3,195
Total comprehensive income for the period, Noncontrolling Interest | 53 | 111 | 157 | 218
Total comprehensive income for the period, Total Equity | 1,354 | 1,919 | 3,343 | 3,413
Common Stock issued under employee plans | 110 | 91 | 181 | 170
Common Stock repurchased | 27 | 437 | 52 | 1,370
Dividends on Common Stock | 535 | 503 | 1,070 | 1,008
Dividends on ESOP Common Stock | 17 | 17 | 35 | 35
Dividends attributable to noncontrolling interest | 73 | 64 | 139 | 112
Noncontrolling Interest, Increase from Capital Contributions | 42 | 0 | 162 | 43
Purchase of subsidiary shares from noncontrolling interest, net | 0 | 5 | 2 | 6
Non-controlling interest, decrease from disposition of non-controlling interest |  |  | 8 | 0
Redeemable noncontrolling interest fair value adjustment | 0 | 94 | 2 | 95
Other | 0 | 7 | (27) | 14
Shareowners' Equity, end of period | 31,364 | 28,442 | 31,364 | 28,442
Noncontrolling interest, end of period | 1,982 | 1,713 | 1,982 | 1,713
Total Equity, end of period | 33,346 | 30,155 | 33,346 | 30,155
Shareowners' Equity |  |  |  |
Purchase of subsidiary shares from noncontrolling interest, net | 0 | 1 | 1 | 1
Redeemable noncontrolling interest fair value adjustment | 0 | 94 | 2 | 95
Other | 2 | (1) | (27) | (7)
Noncontrolling Interest |  |  |  |
Purchase of subsidiary shares from noncontrolling interest, net | 0 | 4 | 1 | 5
Redeemable noncontrolling interest fair value adjustment | 0 | 0 | 0 | 0
Other | $ (2) | $ 8 | 0 | 21
Accounting Standards Update 2014-09 [Member] |  |  |  |
Other |  |  | $ 480 | $ 0

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