|
Global Health Care Medical Costs Payable - Prior Year Development (Details) (Accident and health insurance [Member], USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
12 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Dec. 31, 2014
|
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] |
|
|
|
| (Favorable) Unfavorable incurred costs related to prior years' claims payable |
$ (109) |
|
$ (159) |
| Incurred costs related to prior years' claims payable percentage |
0.60% |
|
1.00% |
| Favorable (unfavorable) impact of prior development on shareholders' net income |
25 |
30 |
|
| Completion Factors [Member] |
|
|
|
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] |
|
|
|
| (Favorable) Unfavorable incurred costs related to prior years' claims payable |
(36) |
|
(61) |
| Incurred costs related to prior years' claims payable percentage |
0.20% |
|
0.40% |
| Medical Cost Trend [Member] |
|
|
|
| Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] |
|
|
|
| (Favorable) Unfavorable incurred costs related to prior years' claims payable |
$ (73) |
|
$ (98) |
| Incurred costs related to prior years' claims payable percentage |
0.40% |
|
0.60% |