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v3.3.1.900

General and Summary of Significant Accounting Policies Change in Accounting Estimate (Details) $ in Millions | 12 Months Ended
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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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