Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ 30,738
Income tax benefit (expense)	$ 397	$ 620	2,254	$ (1,265)
Ending balance	21,836		21,836
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			52	(536)
Change in OCI before reclassifications			(816)	69
Amounts reclassified from AOCI			(64)	46
Income tax benefit (expense)			(63)	73
Ending balance	(891)	(348)	(891)	(348)
Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			34,065	28,112
Change in OCI before reclassifications			(8,331)	7,939
Amounts reclassified from AOCI			(2,184)	(1,045)
Income tax benefit (expense)			2,374	(1,289)
Ending balance	25,924	33,717	25,924	33,717
Pension and Postretirement Unrecognized Net Periodic Benefit (Cost)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(3,379)	(3,537)
Change in OCI before reclassifications			41	8
Amounts reclassified from AOCI			198	210
Income tax benefit (expense)			(57)	(49)
Ending balance	(3,197)	(3,368)	(3,197)	(3,368)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			30,738	24,039
Change in OCI before reclassifications			(9,106)	8,016
Amounts reclassified from AOCI			(2,050)	(789)
Income tax benefit (expense)			2,254	(1,265)
Ending balance	21,836	30,001	21,836	30,001
Cash flow hedges | Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(168)	832
Ending balance	867	1,407	867	1,407
Fair value hedges | Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			10	0
Ending balance	$ (29)	$ (1)	$ (29)	$ (1)