Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Jun. 08, 2021	Apr. 27, 2020
Schedule of debt
Commercial paper	$ 100	$ 100
Total short-term debt	100	100
Total long-term debt	7,254	7,254
Total debt principal	7,354	7,354
Unamortized fair value adjustment	38	39
Unamortized debt issuance costs	(100)	(103)
Total debt	7,292	7,290
Senior Notes [Member] | 7.75% Senior notes due April 15, 2026 [Member]
Schedule of debt
Total long-term debt	$ 200	$ 200
Interest rate (percent)	7.75%	7.75%
Senior Notes [Member] | 6.375% Senior notes due March 15, 2033 [Member]
Schedule of debt
Total long-term debt	$ 500	$ 500
Interest rate (percent)	6.375%	6.375%
Senior Notes [Member] | 6.75% Senior notes due June 20, 2036 [Member]
Schedule of debt
Total long-term debt	$ 400	$ 400
Interest rate (percent)	6.75%	6.75%
Senior Notes [Member] | 6.25% Senior notes due June 15, 2037 [Member]
Schedule of debt
Total long-term debt	$ 800	$ 800
Interest rate (percent)	6.25%	6.25%
Senior Notes [Member] | 5.35% Senior notes due November 1, 2040 [Member]
Schedule of debt
Total long-term debt	$ 750	$ 750
Interest rate (percent)	5.35%	5.35%
Senior Notes [Member] | 4.60% Senior notes due August 1, 2043 [Member]
Schedule of debt
Total long-term debt	$ 500	$ 500
Interest rate (percent)	4.60%	4.60%
Senior Notes [Member] | 4.30% Senior notes due August 25, 2045 [Member]
Schedule of debt
Total long-term debt	$ 400	$ 400
Interest rate (percent)	4.30%	4.30%
Senior Notes [Member] | 3.75% Senior notes due May 15, 2046 [Member]
Schedule of debt
Total long-term debt	$ 500	$ 500
Interest rate (percent)	3.75%	3.75%
Senior Notes [Member] | 4.00% Senior notes due May 30, 2047 [Member]
Schedule of debt
Total long-term debt	$ 700	$ 700
Interest rate (percent)	4.00%	4.00%
Senior Notes [Member] | 4.05% Senior notes due March 7, 2048 [Member]
Schedule of debt
Total long-term debt	$ 500	$ 500
Interest rate (percent)	4.05%	4.05%
Senior Notes [Member] | 4.10% Senior notes due March 4, 2049 [Member]
Schedule of debt
Total long-term debt	$ 500	$ 500
Interest rate (percent)	4.10%	4.10%
Senior Notes [Member] | 2.55% Senior notes due April 27, 2050 [Member]
Schedule of debt
Total long-term debt	$ 500	$ 500
Interest rate (percent)	2.55%	2.55%		2.55%
Senior Notes [Member] | 3.05% Senior notes due June 8, 2051 [Member]
Schedule of debt
Total long-term debt	$ 750	$ 750
Interest rate (percent)	3.05%	3.05%	3.05%
Junior Subordinated Debt [Member] | 7.625% Junior subordinated debentures due December 15, 2027 [Member]
Schedule of debt
Total long-term debt	$ 125	$ 125
Unamortized fair value adjustment	$ 7	$ 8
Interest rate (percent)	7.625%	7.625%
Junior Subordinated Debt [Member] | 8.50% Junior subordinated debentures due December 15, 2045 [Member]
Schedule of debt
Total long-term debt	$ 56	$ 56
Unamortized fair value adjustment	$ 14	$ 14
Interest rate (percent)	8.50%	8.50%
Junior Subordinated Debt [Member] | 8.312% Junior subordinated debentures due July 1, 2046 [Member]
Schedule of debt
Total long-term debt	$ 73	$ 73
Unamortized fair value adjustment	$ 17	$ 17
Interest rate (percent)	8.312%	8.312%