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Fair value measurements Assets Held in Trusts for Retirement Benefits (Details) - Fair value measurements on a recurring basis - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Estimated fair value | Pension benefits
Fair value measurements on a recurring basis
Fair value of plan assets	$ 1,271	$ 1,266
Cash, receivables and payables, net	3	(25)
Total assets	1,268	1,291
Estimated fair value | Pension benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	640	649
Estimated fair value | Pension benefits | Equity index funds
Fair value measurements on a recurring basis
Fair value of plan assets	119	132
Estimated fair value | Pension benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	425	428
Estimated fair value | Pension benefits | Pooled and mutual funds and other
Fair value measurements on a recurring basis
Fair value of plan assets	84	82
Estimated fair value | Other benefits
Fair value measurements on a recurring basis
Fair value of plan assets	171	180
Cash, receivables and payables, net	0	(1)
Total assets	171	181
Estimated fair value | Other benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	92	99
Estimated fair value | Other benefits | Equity index funds
Fair value measurements on a recurring basis
Fair value of plan assets	17	19
Estimated fair value | Other benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	48	49
Estimated fair value | Other benefits | Pooled and mutual funds and other
Fair value measurements on a recurring basis
Fair value of plan assets	14	14
Level 1 | Pension benefits
Fair value measurements on a recurring basis
Total assets	847	903
Level 1 | Pension benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	640	649
Level 1 | Pension benefits | Equity index funds
Fair value measurements on a recurring basis
Fair value of plan assets	119	132
Level 1 | Pension benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	85	121
Level 1 | Pension benefits | Pooled and mutual funds and other
Fair value measurements on a recurring basis
Fair value of plan assets	3	1
Level 1 | Other benefits
Fair value measurements on a recurring basis
Total assets	154	164
Level 1 | Other benefits | Equity securities
Fair value measurements on a recurring basis
Fair value of plan assets	92	99
Level 1 | Other benefits | Equity index funds
Fair value measurements on a recurring basis
Fair value of plan assets	17	19
Level 1 | Other benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	41	43
Level 1 | Other benefits | Pooled and mutual funds and other
Fair value measurements on a recurring basis
Fair value of plan assets	4	3
Level 2 | Pension benefits
Fair value measurements on a recurring basis
Total assets	421	388
Level 2 | Pension benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	340	307
Level 2 | Pension benefits | Pooled and mutual funds and other
Fair value measurements on a recurring basis
Fair value of plan assets	81	81
Level 2 | Other benefits
Fair value measurements on a recurring basis
Total assets	17	17
Level 2 | Other benefits | Fixed income securities and public mutual funds
Fair value measurements on a recurring basis
Fair value of plan assets	7	6
Level 2 | Other benefits | Pooled and mutual funds and other
Fair value measurements on a recurring basis
Fair value of plan assets	10	11
Level 3 | Pension benefits
Fair value measurements on a recurring basis
Total assets	0	0
Level 3 | Pension benefits | Pooled and mutual funds and other
Fair value measurements on a recurring basis
Fair value of plan assets	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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