Shareholders' Equity (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Shareholders' equity activity [Roll Forward] |
|
|
|
|
| Balance at beginning of period |
|
|
$ 15,495
|
$ 16,298
|
| Stock plans |
|
|
348
|
380
|
| Payments of dividends to shareholders |
|
|
(465)
|
(460)
|
| Other |
|
|
(39)
|
(45)
|
| Comprehensive income (loss) |
$ 8
|
$ (206)
|
(5,613)
|
(693)
|
| Balance at end of period |
9,726
|
15,480
|
9,726
|
15,480
|
| Company shareholders' equity |
|
|
|
|
| Shareholders' equity activity [Roll Forward] |
|
|
|
|
| Balance at beginning of period |
|
|
15,462
|
16,267
|
| Stock plans |
|
|
348
|
380
|
| Payments of dividends to shareholders |
|
|
(465)
|
(460)
|
| Other |
|
|
(52)
|
(44)
|
| Comprehensive income (loss) |
|
|
(5,611)
|
(695)
|
| Balance at end of period |
9,682
|
15,448
|
9,682
|
15,448
|
| Noncontrolling interest in consolidated subsidiaries |
|
|
|
|
| Shareholders' equity activity [Roll Forward] |
|
|
|
|
| Balance at beginning of period |
|
|
33
|
31
|
| Stock plans |
|
|
0
|
0
|
| Payments of dividends to shareholders |
|
|
0
|
0
|
| Other |
|
|
13
|
(1)
|
| Comprehensive income (loss) |
|
|
(2)
|
2
|
| Balance at end of period |
$ 44
|
$ 32
|
$ 44
|
$ 32
|