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Employee Benefits - Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value of defined benefit plans assets by asset class |  |
Collective investment funds | $ 793 | $ 749
Fair value of plan assets, excluding collective investment funds | 1,426 | 1,324
Fair value of defined benefit plans assets by asset class, total | 2,219 | 2,073
Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 219 | 251
Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 1,168 | 1,062
Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 39 | 11
Cash and short-term investments |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 10 | 38
Cash and short-term investments | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 10 | 38
Cash and short-term investments | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Cash and short-term investments | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
US indexed equity securities |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 50 | 69
US indexed equity securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 50 | 69
US indexed equity securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
US indexed equity securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
U.S. growth and value |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 109 | 103
U.S. growth and value | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 109 | 103
U.S. growth and value | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
U.S. growth and value | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
UK equity securities |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 5 | 3
UK equity securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 5 | 3
UK equity securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
UK equity securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
International equity securities excluding UK |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 45 | 38
International equity securities excluding UK | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 45 | 38
International equity securities excluding UK | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
International equity securities excluding UK | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Long duration strategy |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 1,076 | 970
Long duration strategy | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Long duration strategy | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 1,076 | 970
Long duration strategy | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Intermediate duration securities |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 35 | 32
Intermediate duration securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Intermediate duration securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 35 | 32
Intermediate duration securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Agency mortgage backed securities |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 5 | 5
Agency mortgage backed securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Agency mortgage backed securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 5 | 5
Agency mortgage backed securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Asset-backed securities |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 19 | 19
Asset-backed securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Asset-backed securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 19 | 19
Asset-backed securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Non-agency mortgage backed securities |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 15 | 20
Non-agency mortgage backed securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
Non-agency mortgage backed securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 15 | 20
Non-agency mortgage backed securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
International fixed income securities |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 18 | 16
International fixed income securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
International fixed income securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 18 | 16
International fixed income securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
U.K. |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 39 | 11
U.K. | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
U.K. | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | 0 | 0
U.K. | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of defined benefit plans assets by asset class, total | $ 39 | $ 11

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: 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=82843861&loc=d3e1928-114920 + Details
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