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General and Summary of Significant Accounting Policies Change in Accounting Estimate (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 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)
Postretirement Benefit Costs [Member] | UNITED STATES |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | (1)
Postretirement Benefit Costs [Member] | UNITED KINGDOM |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | (1)
Postretirement Benefit Costs [Member] | Disaggregated Rate Approach [Member] |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 16
Postretirement Benefit Costs [Member] | Disaggregated Rate Approach [Member] | UNITED STATES |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 13
Postretirement Benefit Costs [Member] | Disaggregated Rate Approach [Member] | UNITED KINGDOM |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 3
Postretirement Benefit Costs [Member] | Aggregated Rate Approach [Member] |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 18
Postretirement Benefit Costs [Member] | Aggregated Rate Approach [Member] | UNITED STATES |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 14
Postretirement Benefit Costs [Member] | Aggregated Rate Approach [Member] | UNITED KINGDOM |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 4
Interest Expense [Member] |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | (11)
Interest Expense [Member] | UNITED STATES |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | (9)
Interest Expense [Member] | UNITED KINGDOM |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | (2)
Interest Expense [Member] | Disaggregated Rate Approach [Member] |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 49
Interest Expense [Member] | Disaggregated Rate Approach [Member] | UNITED STATES |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 42
Interest Expense [Member] | Disaggregated Rate Approach [Member] | UNITED KINGDOM |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 7
Interest Expense [Member] | Aggregated Rate Approach [Member] |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 60
Interest Expense [Member] | Aggregated Rate Approach [Member] | UNITED STATES |
Change in Accounting Estimate [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results | 51
Interest Expense [Member] | Aggregated Rate Approach [Member] | UNITED KINGDOM |
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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