Employee Benefit Plans (Details Textual) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| U.S. (Pension Benefits) [Member] | ||
| Employee Benefit Plans (Textual) [Abstract] | ||
| Company contributions | $ 19 | |
| Expected company contributions | 340 | |
| Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements | (60) | $ (82) |
| Int'l (Pension Benefits) [Member] | ||
| Employee Benefit Plans (Textual) [Abstract] | ||
| Company contributions | 41 | |
| Expected company contributions | 120 | |
| Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements | 0 | 0 |
| Other Postretirement Benefit Plans, Defined Benefit [Member] | ||
| Employee Benefit Plans (Textual) [Abstract] | ||
| Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements | $ 0 | $ 0 |