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Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
U.S. Defined Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | $ 1,044 | $ 1,021 | $ 1,061
U.S. Defined Benefit Plans | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,011 | 968 |
U.S. Defined Benefit Plans | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 33 | 53 |
U.S. Defined Benefit Plans | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 532 | 457 |
U.S. Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 532 | 457 |
U.S. Defined Benefit Plans | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Government debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 86 | 53 |
U.S. Defined Benefit Plans | Government debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 86 | 53 |
U.S. Defined Benefit Plans | Government debt securities | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Government debt securities | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [1] | 393 | 458 |
U.S. Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [1] | 393 | 458 |
U.S. Defined Benefit Plans | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [1] | 0 | 0 |
U.S. Defined Benefit Plans | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [1] | 0 | 0 |
U.S. Defined Benefit Plans | Real estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 33 | 30 |
U.S. Defined Benefit Plans | Real estate | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Real estate | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 33 | 30 |
U.S. Defined Benefit Plans | Real estate | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Other investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 23 |
U.S. Defined Benefit Plans | Other investments | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Other investments | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 23 |
U.S. Defined Benefit Plans | Other investments | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2,824 | 2,195 | 3,144
Foreign Defined Benefit Plans | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 424 | 400 |
Foreign Defined Benefit Plans | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2,116 | 1,559 |
Foreign Defined Benefit Plans | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 284 | 236 | $ 389
Foreign Defined Benefit Plans | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 175 | 156 |
Foreign Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 175 | 156 |
Foreign Defined Benefit Plans | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Private equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 150 | 124 |
Foreign Defined Benefit Plans | Private equity | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 0 | 0 |
Foreign Defined Benefit Plans | Private equity | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 0 | 0 |
Foreign Defined Benefit Plans | Private equity | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 150 | 124 |
Foreign Defined Benefit Plans | Corporate debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 67 | 0 |
Foreign Defined Benefit Plans | Corporate debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Corporate debt securities | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 67 | 0 |
Foreign Defined Benefit Plans | Corporate debt securities | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Government debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 10 | 40 |
Foreign Defined Benefit Plans | Government debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 10 | 11 |
Foreign Defined Benefit Plans | Government debt securities | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 29 |
Foreign Defined Benefit Plans | Government debt securities | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 2,264 | 1,747 |
Foreign Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 215 | 217 |
Foreign Defined Benefit Plans | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 2,049 | 1,530 |
Foreign Defined Benefit Plans | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 0 | 0 |
Foreign Defined Benefit Plans | Real estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 89 | 73 |
Foreign Defined Benefit Plans | Real estate | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 0 | 0 |
Foreign Defined Benefit Plans | Real estate | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 0 | 0 |
Foreign Defined Benefit Plans | Real estate | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 89 | 73 |
Foreign Defined Benefit Plans | Participant loans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [4] | 42 | 37 |
Foreign Defined Benefit Plans | Participant loans | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [4] | 0 | 0 |
Foreign Defined Benefit Plans | Participant loans | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [4] | 0 | 0 |
Foreign Defined Benefit Plans | Participant loans | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [4] | 42 | 37 |
Foreign Defined Benefit Plans | Other assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 27 | 18 |
Foreign Defined Benefit Plans | Other assets | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 24 | 16 |
Foreign Defined Benefit Plans | Other assets | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Other assets | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | $ 3 | $ 2 |
[1] | Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment
[2] | Plan assets of our Brazilian subsidiaries are invested in private equities and commercial real estate through the plan administrator in Brazil. The fair value of these assets is determined using the income approach through annual appraisals based on a discounted cash flow analysis
[3] | Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment
[4] | Loans to participants are stated at cost, which approximates fair value

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