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Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
U.S. Defined Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | $ 1,021 | $ 1,061 | $ 941
U.S. Defined Benefit Plans | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 968 | 1,011 |
U.S. Defined Benefit Plans | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 53 | 50 |
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 |  | 457 | 467 |
U.S. Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 457 | 467 |
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 |  | 53 | 67 |
U.S. Defined Benefit Plans | Government debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 53 | 67 |
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] | 458 | 473 |
U.S. Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [1] | 458 | 473 |
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 |  | 30 | 26 |
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 |  | 30 | 26 |
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 | Cash and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 4 |
U.S. Defined Benefit Plans | Cash and cash equivalents | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 4 |
U.S. Defined Benefit Plans | Cash and cash equivalents | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.S. Defined Benefit Plans | Cash and cash equivalents | 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 |  | 23 | 24 |
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 |  | 23 | 24 |
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 |  | 2,284 | 3,272 | 3,605
Foreign Defined Benefit Plans | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 421 | 523 |
Foreign Defined Benefit Plans | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,623 | 2,353 |
Foreign Defined Benefit Plans | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 240 | 396 | $ 530
Foreign Defined Benefit Plans | Common stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 9 | 21 |
Foreign Defined Benefit Plans | Common stock | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 9 | 21 |
Foreign Defined Benefit Plans | Common stock | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Common stock | 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 |  | 167 | 274 |
Foreign Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 167 | 274 |
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] | 126 | 237 |
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] | 126 | 237 |
Foreign Defined Benefit Plans | Certificates of deposit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2 | 3 |
Foreign Defined Benefit Plans | Certificates of deposit | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Certificates of deposit | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2 | 3 |
Foreign Defined Benefit Plans | Certificates of deposit | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Unsecured debentures |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 5 | 10 |
Foreign Defined Benefit Plans | Unsecured debentures | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Unsecured debentures | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 5 | 10 |
Foreign Defined Benefit Plans | Unsecured debentures | 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 |  | 90 | 110 |
Foreign Defined Benefit Plans | Government debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 11 | 12 |
Foreign Defined Benefit Plans | Government debt securities | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 79 | 98 |
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] | 1,753 | 2,451 |
Foreign Defined Benefit Plans | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 218 | 215 |
Foreign Defined Benefit Plans | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 1,535 | 2,236 |
Foreign Defined Benefit Plans | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 0 | 0 |
Foreign Defined Benefit Plans | Other debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2 | 6 |
Foreign Defined Benefit Plans | Other debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Other debt securities | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2 | 6 |
Foreign Defined Benefit Plans | Other debt securities | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Real estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 74 | 103 |
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] | 74 | 103 |
Foreign Defined Benefit Plans | Cash and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 1 |
Foreign Defined Benefit Plans | Cash and cash equivalents | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 1 |
Foreign Defined Benefit Plans | Cash and cash equivalents | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Cash and cash equivalents | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Defined Benefit Plans | Participant loans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [4] | 37 | 52 |
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] | 37 | 52 |
Foreign Defined Benefit Plans | Other assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 19 | 4 |
Foreign Defined Benefit Plans | Other assets | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 16 | 0 |
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 | $ 4 |
[1] | (1)Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment.
[2] | (1) 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] | (2) Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment.
[4] | (3) Loans to participants are stated at cost, which approximates fair value.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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