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Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | $ 455,000,000 | $ 402,000,000 | $ 379,000,000
Foreign Plan [Member] | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 355,000,000 | 300,000,000 |
Foreign Plan [Member] | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 90,000,000 | 90,000,000 |
Foreign Plan [Member] | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 10,000,000 | 12,000,000 |
Foreign Plan [Member] | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 20,000,000 | 71,000,000 |
Foreign Plan [Member] | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 20,000,000 | 71,000,000 |
Foreign Plan [Member] | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Private equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,000,000 | 4,000,000 |
Foreign Plan [Member] | Private equity | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Private equity | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Private equity | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,000,000 | 4,000,000 |
Foreign Plan [Member] | Government debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 11,000,000 | 10,000,000 |
Foreign Plan [Member] | Government debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 11,000,000 | 10,000,000 |
Foreign Plan [Member] | Government debt securities | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Government debt securities | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [1] | 413,000,000 | 305,000,000 |
Foreign Plan [Member] | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 323,000,000 | 215,000,000 |
Foreign Plan [Member] | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 90,000,000 | 90,000,000 |
Foreign Plan [Member] | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Real estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2,000,000 | 3,000,000 |
Foreign Plan [Member] | Real estate | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Real estate | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Real estate | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 2,000,000 | 3,000,000 |
Foreign Plan [Member] | Participant loans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [2] | 0 | 2,000,000 |
Foreign Plan [Member] | Participant loans | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Participant loans | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Participant loans | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 2,000,000 |
Foreign Plan [Member] | Other assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 8,000,000 | 7,000,000 |
Foreign Plan [Member] | Other assets | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,000,000 | 4,000,000 |
Foreign Plan [Member] | Other assets | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
Foreign Plan [Member] | Other assets | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 7,000,000 | 3,000,000 |
UNITED STATES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,127,000,000 | 1,044,000,000 | $ 1,021,000,000
UNITED STATES | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 1,091,000,000 | 1,011,000,000 |
UNITED STATES | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 36,000,000 | 33,000,000 |
UNITED STATES | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 359,000,000 | 532,000,000 |
UNITED STATES | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 359,000,000 | 532,000,000 |
UNITED STATES | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Government debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 135,000,000 | 86,000,000 |
UNITED STATES | Government debt securities | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 135,000,000 | 86,000,000 |
UNITED STATES | Government debt securities | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Government debt securities | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets | [3] | 593,000,000 | 393,000,000 |
UNITED STATES | Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 593,000,000 | 393,000,000 |
UNITED STATES | Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Real estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 36,000,000 | 33,000,000 |
UNITED STATES | Real estate | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
UNITED STATES | Real estate | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | 36,000,000 | 33,000,000 |
UNITED STATES | Real estate | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total plan assets |  | $ 0 | $ 0 |
[1] | Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment
[2] | Loans to participants are stated at cost, which approximates fair value
[3] | Mutual funds categorized as debt securities consist of mutual funds for which debt securities are the primary underlying investment

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