Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (DAC and VOBA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net [Abstract]
Beginning Balance of DAC	$ 15,570	$ 14,789	$ 13,830
Capitalization of DAC	3,358	3,254	3,002
Net investment gains (losses) of DAC and net derivative gains (losses) of DAC	(117)	(109)	60
Other expenses of DAC	(2,534)	(2,599)	(2,426)
Total amortization of DAC	(2,651)	(2,708)	(2,366)
Unrealized investment gains (losses) of DAC	(1,461)	511	(525)
Effect of foreign currency translation and other of DAC	(26)	(276)	848
Ending Balance of DAC	14,790	15,570	14,789
Beginning Balance of VOBA	3,325	3,630	3,760
Other expenses of VOBA	(245)	(267)	(315)
Unrealized investment gains (losses) of VOBA	(4)	10	(4)
Effect of foreign currency translation and other of VOBA	(33)	(48)	189
Ending Balance of VOBA	3,043	3,325	3,630
Balance at December 31,	$ 17,833	$ 18,895	$ 18,419