Capital Structure - Schedule of Total Debt Outstanding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Due in one year through five years	$ 1,500	$ 2,250
Due after five years through ten years	1,832	1,082
Due after ten years	4,659	4,659
Total long-term debt principal	7,991	7,991
Fair value adjustments	7	26
Debt issuance costs	(56)	(53)
Total long-term debt	7,942	7,964
Short-term debt	0	0
Total debt	$ 7,942	7,964
Redemption price as percentage of principal amount plus accrued and unpaid interest	100.00%
Floating Rate Senior Notes, due 2023
Debt Instrument [Line Items]
Due in one year through five years	$ 0	250
Interest rate spread over LIBOR (as a percent)	0.63%
3.150% Senior Notes, due 2023
Debt Instrument [Line Items]
Due in one year through five years	$ 0	500
Note stated interest rate (as a percent)	3.15%
6.750% Senior Notes due 2024
Debt Instrument [Line Items]
Due in one year through five years	$ 350	350
Note stated interest rate (as a percent)	6.75%
0.750% Senior Notes, due 2025
Debt Instrument [Line Items]
Due in one year through five years	$ 600	600
Note stated interest rate (as a percent)	0.75%
3.280% Senior Notes, due 2026
Debt Instrument [Line Items]
Due in one year through five years	$ 550	550
Note stated interest rate (as a percent)	3.28%
1.450% Senior Notes, due 2030
Debt Instrument [Line Items]
Due after five years through ten years	$ 600	600
Note stated interest rate (as a percent)	1.45%
6.125% Senior Notes, due 2032
Debt Instrument [Line Items]
Due after five years through ten years	$ 159	159
Note stated interest rate (as a percent)	6.125%
5.250% Senior Notes due 2033
Debt Instrument [Line Items]
Due after five years through ten years	$ 750	0
Note stated interest rate (as a percent)	5.25%
5.350% Senior Notes due 2033
Debt Instrument [Line Items]
Due after five years through ten years	$ 323	323
Note stated interest rate (as a percent)	5.35%
5.550% Senior Notes due 2035
Debt Instrument [Line Items]
Due after ten years	$ 546	546
Note stated interest rate (as a percent)	5.55%
5.950% Senior Notes, due 2036
Debt Instrument [Line Items]
Due after ten years	$ 386	386
Note stated interest rate (as a percent)	5.95%
6.900% Senior Debentures, due 2038
Debt Instrument [Line Items]
Due after ten years	$ 165	165
Note stated interest rate (as a percent)	6.90%
5.200% Senior Notes due 2042
Debt Instrument [Line Items]
Due after ten years	$ 62	62
Note stated interest rate (as a percent)	5.20%
4.500% Senior Notes, due 2043
Debt Instrument [Line Items]
Due after ten years	$ 500	500
Note stated interest rate (as a percent)	4.50%
4.200% Senior Notes, due 2046
Debt Instrument [Line Items]
Due after ten years	$ 700	700
Note stated interest rate (as a percent)	4.20%
3.850% Senior Notes, due 2049
Debt Instrument [Line Items]
Due after ten years	$ 500	500
Note stated interest rate (as a percent)	3.85%
Floating Rate Subordinated Debentures, due 2053
Debt Instrument [Line Items]
Due after ten years	$ 500	500
Floating Rate Subordinated Debentures, due 2053
Debt Instrument [Line Items]
Due after ten years	800	800
6.500% Junior Subordinated Debentures, due 2067
Debt Instrument [Line Items]
Due after ten years	500	$ 500
Total long-term debt	$ 500
Note stated interest rate (as a percent)	6.50%