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Employee Benefits - Schedule of changes in Level 3 fair value for U.S. Pension Plans (Details) - U.S. - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Actual return on plan assets: |  |
Balance at the beginning of the period | $ 1,951 | $ 2,036
Balance at the end of the period | 1,683 | 1,951
Significant Unobservable Inputs (Level 3) |  |
Actual return on plan assets: |  |
Balance at the beginning of the period | 0 |
Balance at the end of the period | $ 0 | $ 0

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