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Noncontrolling Interests (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Activity for equity attributable to noncontrolling interests |  |  |  |  |
Beginning Balance |  |  |  | $ 30,801 | $ 35,226
Net income (loss) |  | $ 1,873 | $ 436 | 4,427 | (2,391)
Dividends paid |  |  |  | (1,009) | (986)
Repurchase of company common stock |  |  |  | (2,073) | (2,045)
Distributions to noncontrolling interests |  |  |  | (105) | (84)
Other | [1] |  |  | 258 | 992
Ending Balance |  | 32,079 | 30,712 | 32,079 | 30,712
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
Activity for equity attributable to noncontrolling interests |  |  |  |  |
Beginning Balance |  |  |  | 30,801 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Activity for equity attributable to noncontrolling interests |  |  |  |  |
Change in Accounting Principle | [2] |  |  | (220) |
Common Stockholders' Equity [Member] |  |  |  |  |
Activity for equity attributable to noncontrolling interests |  |  |  |  |
Beginning Balance |  |  |  | 30,607 | 34,974
Net income (loss) |  |  |  | 4,389 | (2,434)
Dividends paid |  |  |  | (1,009) | (986)
Repurchase of company common stock |  |  |  | (2,073) | (2,045)
Distributions to noncontrolling interests |  |  |  | 0 | 0
Other | [1] |  |  | 256 | 991
Ending Balance |  | 31,950 | 30,500 | 31,950 | 30,500
Common Stockholders' Equity [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Activity for equity attributable to noncontrolling interests |  |  |  |  |
Change in Accounting Principle | [2] |  |  | (220) |
Noncontrolling Interest [Member] |  |  |  |  |
Activity for equity attributable to noncontrolling interests |  |  |  |  |
Beginning Balance |  |  |  | 194 | 252
Net income (loss) |  |  |  | 38 | 43
Dividends paid |  |  |  | 0 | 0
Repurchase of company common stock |  |  |  | 0 | 0
Distributions to noncontrolling interests |  |  |  | (105) | (84)
Other | [1] |  |  | 2 | 1
Ending Balance |  | $ 129 | $ 212 | 129 | $ 212
Noncontrolling Interest [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Activity for equity attributable to noncontrolling interests |  |  |  |  |
Change in Accounting Principle | [2] |  |  | $ 0 |
[1] | **Includes components of other comprehensive income, which are disclosed separately in our Consolidated Statement of Comprehensive Income.
[2] | *See Note 2—Changes in Accounting Principles for additional information related to ASC Topic 606.

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