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General and Summary of Significant Accounting Policies Change in Accounting Estimate (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	$ (2)
Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	(11)
UNITED STATES | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	(1)
UNITED STATES | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	(9)
UNITED KINGDOM | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	(1)
UNITED KINGDOM | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	(2)
Disaggregated Rate Approach [Member] | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	16
Disaggregated Rate Approach [Member] | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	49
Disaggregated Rate Approach [Member] | UNITED STATES | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	13
Disaggregated Rate Approach [Member] | UNITED STATES | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	42
Disaggregated Rate Approach [Member] | UNITED KINGDOM | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	3
Disaggregated Rate Approach [Member] | UNITED KINGDOM | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	7
Aggregated Rate Approach [Member] | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	18
Aggregated Rate Approach [Member] | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	60
Aggregated Rate Approach [Member] | UNITED STATES | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	14
Aggregated Rate Approach [Member] | UNITED STATES | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	51
Aggregated Rate Approach [Member] | UNITED KINGDOM | Postretirement Benefit Costs [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	4
Aggregated Rate Approach [Member] | UNITED KINGDOM | Interest Expense [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	$ 9

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Amount of the effect of a change in accounting principle on operating profit or loss.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22499-107794

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22580-107794

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22583-107794

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