Global Health Care Medical Claims Payable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Paid claims related to:
Add: Reinsurance and other amounts recoverable	$ 7,299	$ 6,256
Accident and health insurance [Member]
Schedule Of Reported and Incurred but not Reported (IBNR) Medical Claims Payable (Details) [Abstract]
Incurred but not yet reported	1,615	1,466
Reported claims in process	355	318
Other medical expense payable	80	72
Medical claims payable	2,050	1,856
Schedule Of Medical Claims Payable Activity [Abstract]
Claims payable, beginning balance, gross	1,856	1,305	1,400
Less: Reinsurance and other amounts recoverable	242	249	284
Balance at January 1, net	1,614	1,056	1,116
Acquired net:	0	504	0
Incurred claims related to:
Current year	16,049	14,428	9,265
Prior years	(182)	(200)	(140)
Total incurred	15,867	14,228	9,125
Paid claims related to:
Current year	14,267	12,854	8,227
Prior years	1,358	1,320	958
Total paid	15,625	14,174	9,185
Balance at December 31, net	1,856	1,614	1,056
Add: Reinsurance and other amounts recoverable	194	242	249
Claims payable, ending balance, gross	2,050	1,856	1,305
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract]
(Favorable) Unfavorable incurred claims related to prior years' claims payable	(182)	(200)
Incurred claims related to prior years' claims payable percentage	1.30%	2.20%
Impact Of Prior Year Development On Shareholders Net Income	77	66
Completion Factors [Member] | Accident and health insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract]
(Favorable) Unfavorable incurred claims related to prior years' claims payable	(74)	(91)
Incurred claims related to prior years' claims payable percentage	0.50%	1.00%
Medical Cost Trend [Member] | Accident and health insurance [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract]
(Favorable) Unfavorable incurred claims related to prior years' claims payable	$ (108)	$ (109)
Incurred claims related to prior years' claims payable percentage	0.80%	1.20%