Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amount:
Federal income tax	$ 665	$ 526	$ 756
Taxes on foreign earnings, net of federal benefit	139	131	42
Net effects of noncontrolling interests	(10)	(65)	(14)
State income tax, net of federal benefit	68	46	38
Dividend received deduction	(39)	(31)	(56)
Adjustments to uncertain tax positions	(5)	(47)	(12)
Impact of the 2017 Tax Reform	0	0	1,240
Nondeductible goodwill	108	58	0
General business credit	0	(64)	(95)
Other	0	33	39
Total	$ 926	$ 587	$ 1,938
Percent:
Federal income tax, percent	21.00%	21.00%	35.00%
Taxes on foreign earnings, net of federal benefit, percent	4.40%	5.20%	1.90%
Net effects of noncontrolling interests, percent	(0.30%)	(2.60%)	(0.70%)
State income tax, net of federal benefit, percent	2.10%	1.80%	1.80%
Dividend received deduction, percent	(1.10%)	(1.20%)	(2.60%)
Adjustments to uncertain tax positions, percent	(0.20%)	(1.90%)	(0.60%)
Impact of the 2017 Tax Reform, percent	0	0	0.574
Nondeductible goodwill, percent	3.40%	2.30%	0.00%
General business credit, percent	0.00%	(2.60%)	(4.40%)
Other, percent	0.00%	1.40%	1.90%
Total, percent	29.30%	23.40%	89.70%