Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 27, 2022
Debt Disclosure [Abstract]
Gain (Loss) on Extinguishment of Debt	$ 0	$ (42,000,000)	$ 0
Debt Instrument [Line Items]
Long-term Debt and Lease Obligation, Including Current Maturities	7,636,000,000	7,928,000,000
Debt Instrument, Unamortized Discount	$ (68,000,000)	(76,000,000)
Debt instrument call feature description	We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.
Long-term Line of Credit				$ 3,500,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 382,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	90,000,000
Long-term Debt, Maturities Repayments of Principal in Year Five	0
Gain (Loss) on Extinguishment of Debt	0	(42,000,000)	$ 0
Long-Term Debt, Maturity, Year One	0
Short-term borrowings and current maturities of long-term debt	0	0
Senior notes due November 2045
Debt Disclosure [Abstract]
Long-term debt	$ 1,911,000,000	2,000,000,000
Debt Instrument [Line Items]
Interest rate (in hundredths)	5.00%
Long-term debt	$ 1,911,000,000	2,000,000,000
Debt Instrument, Repurchase Amount	29,000,000
Senior Notes due November 2025
Debt Disclosure [Abstract]
Long-term debt	$ 382,000,000	$ 400,000,000
Debt Instrument [Line Items]
Interest rate (in hundredths)	3.80%	3.80%
Long-term debt	$ 382,000,000	$ 400,000,000
Early Repayment of Senior Debt		600,000,000
Debt Instrument, Repurchase Amount	3,000,000
Repayments of Senior Debt		641,000,000
Senior Notes due November 2035
Debt Disclosure [Abstract]
Long-term debt	1,000,000,000	1,000,000,000
Debt Instrument [Line Items]
Long-term debt	1,000,000,000	1,000,000,000
Senior notes due September 2039
Debt Disclosure [Abstract]
Long-term debt	$ 946,000,000	1,000,000,000
Debt Instrument [Line Items]
Interest rate (in hundredths)	7.45%
Long-term debt	$ 946,000,000	1,000,000,000
Debt Instrument, Repurchase Amount	22,000,000
Senior notes due August 2043
Debt Disclosure [Abstract]
Long-term debt	$ 879,000,000	900,000,000
Debt Instrument [Line Items]
Interest rate (in hundredths)	4.75%
Long-term debt	$ 879,000,000	900,000,000
Debt Instrument, Repurchase Amount	21,000,000
Senior notes due September 2038
Debt Disclosure [Abstract]
Long-term debt	$ 763,000,000	800,000,000
Debt Instrument [Line Items]
Interest rate (in hundredths)	670.00%
Long-term debt	$ 763,000,000	800,000,000
Debt Instrument, Repurchase Amount	21,000,000
Senior notes due November 2041
Debt Disclosure [Abstract]
Long-term debt	500,000,000	500,000,000
Debt Instrument [Line Items]
Long-term debt	500,000,000	500,000,000
Senior debentures due August 2096
Debt Disclosure [Abstract]
Long-term debt	$ 228,000,000	294,000,000
Debt Instrument [Line Items]
Interest rate (in hundredths)	7.60%
Debt instruments non-call feature description	may not be redeemed prior to maturity
Long-term debt	$ 228,000,000	294,000,000
Debt Instrument, Repurchase Amount	58,000,000
Senior notes due February 2027
Debt Disclosure [Abstract]
Long-term debt	90,000,000	104,000,000
Debt Instrument [Line Items]
Long-term debt	90,000,000	104,000,000
Other Debt Obligations
Debt Disclosure [Abstract]
Long-term debt	5,000,000	6,000,000
Debt Instrument [Line Items]
Long-term debt	5,000,000	6,000,000
Senior notes due March 2030
Debt Disclosure [Abstract]
Long-term debt	1,000,000,000	1,000,000,000
Debt Instrument [Line Items]
Long-term debt	$ 1,000,000,000	$ 1,000,000,000
Senior Notes due 2039
Debt Instrument [Line Items]
Interest rate (in hundredths)	745.00%
Debt Instrument, Repurchase Amount	$ 32,000,000
Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate (in hundredths)	6.75%
Senior & Medium Term Notes due with Various Maturity Dates
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 150,000,000
Senior Notes due 2096
Debt Instrument [Line Items]
Interest rate (in hundredths)	7.60%
Debt Instrument, Repurchase Amount	$ 8,000,000
Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate (in hundredths)	3.80%
Debt Instrument, Repurchase Amount	$ 15,000,000
Medium term notes due 2027
Debt Instrument [Line Items]
Interest rate (in hundredths)	6.75%
Debt Instrument, Repurchase Amount	$ 14,000,000
Senior Notes due 2045
Debt Instrument [Line Items]
Interest rate (in hundredths)	5.00%
Debt Instrument, Repurchase Amount	$ 60,000,000
Senior Notes due September 2038
Debt Instrument [Line Items]
Interest rate (in hundredths)	6.70%
Debt Instrument, Repurchase Amount	$ 16,000,000
Outstanding balance of Senior Notes due Various Dates
Debt Disclosure [Abstract]
Long-term debt	5,200,000,000
Debt Instrument [Line Items]
Long-term debt	5,200,000,000
Outstanding balance of Senior Notes due November 2025
Debt Disclosure [Abstract]
Long-term debt	382,000,000
Debt Instrument [Line Items]
Long-term debt	$ 382,000,000