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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount:
Federal income tax	$ 139	$ 665	$ 526
Taxes on foreign earnings, net of federal benefit	2	139	131
Net effects of noncontrolling interests	(13)	(10)	(65)
State income tax, net of federal benefit	52	68	46
Dividend received deduction	(27)	(39)	(31)
Adjustments to uncertain tax positions	3	(5)	(47)
Nondeductible goodwill	336	108	58
General business credit	0	0	(64)
Federal refunds	(20)	0	0
Other	9	0	33
Total	$ 481	$ 926	$ 587
Percent:
Federal income tax, percent	21.00%	21.00%	21.00%
Taxes on foreign earnings, net of federal benefit, percent	0.30%	4.40%	5.20%
Net effects of noncontrolling interests, percent	(2.00%)	(0.30%)	(2.60%)
State income tax, net of federal benefit, percent	7.90%	2.10%	1.80%
Dividend received deduction, percent	(4.10%)	(1.10%)	(1.20%)
Adjustments to uncertain tax positions, percent	0.50%	(0.20%)	(1.90%)
Nondeductible goodwill, percent	50.80%	3.40%	2.30%
General business credit, percent	0.00%	0.00%	(2.60%)
Federal refunds, percent	(3.00%)	0.00%	0.00%
Other, percent	1.40%	0.00%	1.40%
Total, percent	72.80%	29.30%	23.40%

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