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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed maturities - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	$ 41,071	$ 19,718
Less Than Twelve Months, Gross Unrealized Losses	1,788	486
Twelve Months or More, Fair Value	7,859	9,605
Twelve Months or More, Gross Unrealized Losses	543	463
Total, Fair Value	48,930	29,323
Total, Gross Unrealized Losses	2,331	949
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	3,972	750
Less Than Twelve Months, Gross Unrealized Losses	262	17
Twelve Months or More, Fair Value	1	0
Twelve Months or More, Gross Unrealized Losses	0	0
Total, Fair Value	3,973	750
Total, Gross Unrealized Losses	262	17
Obligations of U.S. states and their political subdivisions
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	541	73
Less Than Twelve Months, Gross Unrealized Losses	27	1
Twelve Months or More, Fair Value	0	0
Twelve Months or More, Gross Unrealized Losses	0	0
Total, Fair Value	541	73
Total, Gross Unrealized Losses	27	1
Foreign government bonds
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	7,459	6,536
Less Than Twelve Months, Gross Unrealized Losses	208	231
Twelve Months or More, Fair Value	1,560	39
Twelve Months or More, Gross Unrealized Losses	130	8
Total, Fair Value	9,019	6,575
Total, Gross Unrealized Losses	338	239
U.S. public corporate securities
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	14,295	3,905
Less Than Twelve Months, Gross Unrealized Losses	805	87
Twelve Months or More, Fair Value	996	1,197
Twelve Months or More, Gross Unrealized Losses	81	106
Total, Fair Value	15,291	5,102
Total, Gross Unrealized Losses	886	193
U.S. private corporate securities
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	4,970	1,712
Less Than Twelve Months, Gross Unrealized Losses	217	52
Twelve Months or More, Fair Value	913	843
Twelve Months or More, Gross Unrealized Losses	68	82
Total, Fair Value	5,883	2,555
Total, Gross Unrealized Losses	285	134
Foreign public corporate securities
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	2,967	1,412
Less Than Twelve Months, Gross Unrealized Losses	93	30
Twelve Months or More, Fair Value	822	376
Twelve Months or More, Gross Unrealized Losses	40	23
Total, Fair Value	3,789	1,788
Total, Gross Unrealized Losses	133	53
Foreign private corporate securities
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	3,676	798
Less Than Twelve Months, Gross Unrealized Losses	118	34
Twelve Months or More, Fair Value	1,965	2,371
Twelve Months or More, Gross Unrealized Losses	210	192
Total, Fair Value	5,641	3,169
Total, Gross Unrealized Losses	328	226
Asset-backed securities
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	1,536	4,132
Less Than Twelve Months, Gross Unrealized Losses	8	25
Twelve Months or More, Fair Value	1,451	4,685
Twelve Months or More, Gross Unrealized Losses	6	49
Total, Fair Value	2,987	8,817
Total, Gross Unrealized Losses	14	74
Commercial mortgage-backed securities
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	1,048	284
Less Than Twelve Months, Gross Unrealized Losses	34	8
Twelve Months or More, Fair Value	139	93
Twelve Months or More, Gross Unrealized Losses	8	3
Total, Fair Value	1,187	377
Total, Gross Unrealized Losses	42	11
Residential mortgage-backed securities
Debt Securities [Line Items]
Less Than Twelve Months, Fair Value	607	116
Less Than Twelve Months, Gross Unrealized Losses	16	1
Twelve Months or More, Fair Value	12	1
Twelve Months or More, Gross Unrealized Losses	0	0
Total, Fair Value	619	117
Total, Gross Unrealized Losses	$ 16	$ 1

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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