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Income Taxes - Reconciliation to Nominal Tax Rate (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Reconciliation of total taxes to nominal federal rate details [Abstract] | ||
| Total taxes | $ 323 | $ 324 |