Other Assets (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Other Assets [Line Items]
Deferred Tax Liabilities, Net	$ 4,786	$ 6,000
Valuation allowances	127	200
Supplementary Insurance Information, Deferred Policy Acquisition Costs	700	764
Continuous Loss Position Less Than Twelve Months [Member]
Other Assets [Line Items]
Fair value on cost method investments in a continuous loss position	17	142
Cost Method Investments Fair Value Insignificant Amount Disclosure	an insignificant amount
Unrealized loss on cost method investments in a continuous loss position		37
Insignificant Amount Of Unrealized Gain Loss On Marketable Securities Cost Method Investments And Other Investments	an insignificant amount
Continuous Loss Position More Than Twelve Months [Member]
Other Assets [Line Items]
Fair value on cost method investments in a continuous loss position		2
Cost Method Investments Fair Value Insignificant Amount Disclosure	an insignificant amount
Unrealized loss on cost method investments in a continuous loss position		$ 0
Insignificant Amount Of Unrealized Gain Loss On Marketable Securities Cost Method Investments And Other Investments	an insignificant amount
Americas [Member]
Other Assets [Line Items]
Category of real estate investments	41.00%
Europe [Member]
Other Assets [Line Items]
Category of real estate investments	35.00%
Asia [Member]
Other Assets [Line Items]
Category of real estate investments	24.00%
Office Building [Member]
Other Assets [Line Items]
Category of real estate investments	52.00%
Apartment Building [Member]
Other Assets [Line Items]
Category of real estate investments	14.00%
Industrial Properties [Member]
Other Assets [Line Items]
Category of real estate investments	7.00%
Retail Facilities [Member]
Other Assets [Line Items]
Category of real estate investments	9.00%
Franchise Properties [Member]
Other Assets [Line Items]
Category of real estate investments	3.00%
Other Properties [Member]
Other Assets [Line Items]
Category of real estate investments	15.00%