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Postretirement Benefit Plans - Plan Assets by Level Three Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
U.S. defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 1,034 | $ 1,019 | $ 1,082
U.S. defined benefit plan | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,034 | 770 |
U.S. defined benefit plan | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 685 | 664 |
U.S. defined benefit plan | Fixed income securities and cash equivalents | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 685 | 415 |
U.S. defined benefit plan | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 349 | 355 |
U.S. defined benefit plan | Equity securities | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 349 | 355 |
U.S. defined benefit plan | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. defined benefit plan | Level 1 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. defined benefit plan | Level 1 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. defined benefit plan | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 249 |
U.S. defined benefit plan | Level 2 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 249 |
U.S. defined benefit plan | Level 2 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. defined benefit plan | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. defined benefit plan | Level 3 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. defined benefit plan | Level 3 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. retiree health care plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 434 | 441 | 497
U.S. retiree health care plan | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 251 | 258 |
U.S. retiree health care plan | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 227 | 220 |
U.S. retiree health care plan | Fixed income securities and cash equivalents | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 44 | 37 |
U.S. retiree health care plan | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 207 | 221 |
U.S. retiree health care plan | Equity securities | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 207 | 221 |
U.S. retiree health care plan | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 180 | 178 |
U.S. retiree health care plan | Level 1 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 180 | 178 |
U.S. retiree health care plan | Level 1 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. retiree health care plan | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3 | 5 |
U.S. retiree health care plan | Level 2 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3 | 5 |
U.S. retiree health care plan | Level 2 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. retiree health care plan | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. retiree health care plan | Level 3 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
U.S. retiree health care plan | Level 3 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Non-U.S. defined benefit plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,309 | 2,134 | $ 2,213
Non-U.S. defined benefit plan | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 2,137 | 1,993 |
Non-U.S. defined benefit plan | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,654 | 1,498 |
Non-U.S. defined benefit plan | Fixed income securities and cash equivalents | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 1,508 | 1,385 |
Non-U.S. defined benefit plan | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 652 | 632 |
Non-U.S. defined benefit plan | Equity securities | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 629 | 608 |
Non-U.S. defined benefit plan | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3 | 4 |
Non-U.S. defined benefit plan | Other | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 0 | 0 |
Non-U.S. defined benefit plan | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 24 | 10 |
Non-U.S. defined benefit plan | Level 1 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 19 | 4 |
Non-U.S. defined benefit plan | Level 1 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 5 | 6 |
Non-U.S. defined benefit plan | Level 1 | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Non-U.S. defined benefit plan | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 145 | 127 |
Non-U.S. defined benefit plan | Level 2 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 127 | 109 |
Non-U.S. defined benefit plan | Level 2 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 18 | 18 |
Non-U.S. defined benefit plan | Level 2 | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Non-U.S. defined benefit plan | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3 | 4 |
Non-U.S. defined benefit plan | Level 3 | Fixed income securities and cash equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Non-U.S. defined benefit plan | Level 3 | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | 0 |
Non-U.S. defined benefit plan | Level 3 | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 3 | $ 4 |
[1] | Consists of bond index and equity index funds, measured at net asset value per share.

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