Principles of Consolidation And Other Matters (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Dec. 31, 2015 |
|
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] | |||||
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements | $ 188,000,000 | $ 188,000,000 | |||
Equity method investments lag period | 3 months | ||||
Investment income (loss) | $ 1,000,000 | $ 3,000,000 | $ (2,000,000) | $ 5,000,000 | |
Effective tax rate | 29.50% | 27.90% | 29.00% | 28.60% | |
Unrecognized tax benefits | $ 70,000,000 | $ 70,000,000 | $ 74,000,000 | ||
Minimum | |||||
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] | |||||
Reasonably possible decrease in unrecognized tax benefits | 0 | 0 | |||
Maximum | |||||
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] | |||||
Reasonably possible decrease in unrecognized tax benefits | $ 7,000,000 | $ 7,000,000 |