Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 10,919	$ 18,072
OCI before reclassifications	(17,064)	(10,170)
Deferred income tax benefit (expense)	3,868	2,222
AOCI before reclassifications, net of income tax	(2,277)	10,124
Amounts reclassified from AOCI	457	218
Deferred income tax benefit (expense)	(98)	(46)
Amounts reclassified from AOCI, net of income tax	359	172
Balance, end of period	(1,912)	10,397
Unrealized Investment Gains (Losses), Net of Related Offsets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	16,042	22,217
OCI before reclassifications	(16,373)	(7,978)
Deferred income tax benefit (expense)	3,833	1,946
AOCI before reclassifications, net of income tax	3,502	16,185
Amounts reclassified from AOCI	321	30
Deferred income tax benefit (expense)	(75)	(7)
Amounts reclassified from AOCI, net of income tax	246	23
Balance, end of period	3,718	16,194
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,629	1,513
OCI before reclassifications	(312)	(1,442)
Deferred income tax benefit (expense)	55	310
AOCI before reclassifications, net of income tax	1,372	381
Amounts reclassified from AOCI	112	174
Deferred income tax benefit (expense)	(20)	(37)
Amounts reclassified from AOCI, net of income tax	92	137
Balance, end of period	1,464	518
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(5,154)	(3,795)
OCI before reclassifications	(382)	(753)
Deferred income tax benefit (expense)	(19)	(34)
AOCI before reclassifications, net of income tax	(5,555)	(4,582)
Amounts reclassified from AOCI	0	0
Deferred income tax benefit (expense)	0	0
Amounts reclassified from AOCI, net of income tax	0	0
Balance, end of period	(5,517)	(4,467)
Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,598)	(1,863)
OCI before reclassifications	3	3
Deferred income tax benefit (expense)	(1)	0
AOCI before reclassifications, net of income tax	(1,596)	(1,860)
Amounts reclassified from AOCI	24	14
Deferred income tax benefit (expense)	(3)	(2)
Amounts reclassified from AOCI, net of income tax	21	12
Balance, end of period	(1,577)	(1,848)
Disposal Group, Held-for-Sale or Disposed of by Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI, net of income tax	6	101
Disposal Group, Held-for-Sale or Disposed of by Sale | Unrealized Investment Gains (Losses), Net of Related Offsets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI, net of income tax	(30)	(14)
Disposal Group, Held-for-Sale or Disposed of by Sale | Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI, net of income tax	0	0
Disposal Group, Held-for-Sale or Disposed of by Sale | Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI, net of income tax	38	115
Disposal Group, Held-for-Sale or Disposed of by Sale | Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from AOCI, net of income tax	$ (2)	$ 0