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Employee Benefits - Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | $ 1,960 | $ 1,987
Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,262 | 1,291
Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 82 | 94
Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,141 | 1,158
Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 39 | 39
Fair Value Measured at Net Asset Value Per Share |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 698 | 696
Cash and short-term investments | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 3 | 4
Cash and short-term investments | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 3 | 4
Cash and short-term investments | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Cash and short-term investments | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.S. indexes | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 23 | 21
U.S. indexes | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 23 | 21
U.S. indexes | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.S. indexes | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.S. growth and value | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 56 | 69
U.S. growth and value | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 56 | 69
U.S. growth and value | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.S. growth and value | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.K. | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
U.K. | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
U.K. | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
U.K. | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
International, excluding U.K. | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
International, excluding U.K. | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
International, excluding U.K. | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
International, excluding U.K. | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets |  | 0
Long duration strategy | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,078 | 1,070
Long duration strategy | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Long duration strategy | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,078 | 1,070
Long duration strategy | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Intermediate duration securities | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 20 | 35
Intermediate duration securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Intermediate duration securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 20 | 35
Intermediate duration securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Agency mortgage backed securities | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 3 | 4
Agency mortgage backed securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Agency mortgage backed securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 3 | 4
Agency mortgage backed securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Asset backed securities | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 14 | 18
Asset backed securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Asset backed securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 14 | 18
Asset backed securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Non-agency mortgage backed securities | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 11 | 13
Non-agency mortgage backed securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Non-agency mortgage backed securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 11 | 13
Non-agency mortgage backed securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
International, excluding U.K. | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 15 | 18
International, excluding U.K. | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
International, excluding U.K. | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 15 | 18
International, excluding U.K. | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.K. | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 39 | 39
U.K. | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.K. | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.K. | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | $ 39 | $ 39

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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