|
Recent Accounting Changes (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||
|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Dec. 31, 2014
|
|
| New Accounting Pronouncements And Changes In Accounting Principles [Abstract] | |||
| Health Care Reform Industry Assessment Fee Liability | $ 310 | $ 238 | |
| Health Care Reform Industry Assessment Fee Expense | $ 80 | $ 60 | |