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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Schedule II - Condensed Financial Information- Notes to Financial Statements (Parent Company) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 17, 2021	Aug. 13, 2018
Debt Instrument [Line Items]
Notes payable	$ 3,096	$ 2,662
Interest	112	73	$ 44
Income taxes	$ 653	315	251
4.50% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					4.50%
3.40% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.40%
Notes payable	$ 643	643
2.45% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.45%
Notes payable	$ 593	592
3.20% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.20%			3.20%
Notes payable	$ 443	0
Parent Company
Debt Instrument [Line Items]
Notes payable	2,519	2,072
Interest	81	58	44
Income taxes	609	317	251
Cash dividends from subsidiaries and affiliates	$ 600	500	$ 500
Parent Company \| 4.50% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.50%
Notes payable	$ 444	443
Parent Company \| 5.50% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.50%
Notes payable	$ 400	399
Parent Company \| 3.40% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.40%
Notes payable	$ 643	643
Parent Company \| 2.45% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.45%
Notes payable	$ 593	592
Parent Company \| 3.20% Notes, net of discount
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.20%
Notes payable	$ 443	0
Parent Company \| Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Notes payable	$ (4)	$ (5)