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Pension Plans and Other Postretirement Benefits - Fair Value Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Level 1
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	$ 44
Cash and money market funds | Level 1
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	8
Fixed income funds | Level 1
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	3
Equity mutual funds | Level 1
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	33
Pension Plans
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	$ 624	$ 613
Pension Plans | Level 1
Pension Plans and Other Postretirement Benefits
Actual plan asset allocations percent	7.00%
Pension Plans | Level 2
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	$ 580
Actual plan asset allocations percent	93.00%
Pension Plans | Level 3
Pension Plans and Other Postretirement Benefits
Actual plan asset allocations percent	0.00%
Pension Plans | Cash and money market funds
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	$ 8
Actual plan asset allocations percent	1.00%
Pension Plans | Fixed income funds
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	$ 583
Actual plan asset allocations percent	94.00%
Pension Plans | Fixed income funds | Level 2
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	$ 580
Pension Plans | Equity mutual funds
Pension Plans and Other Postretirement Benefits
Fair value of plan assets	$ 33
Actual plan asset allocations percent	5.00%

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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 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&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=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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