Debt - Outstanding Amounts of Debt and Finance Leases (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Jan. 15, 2023
Short-term debt
Commercial paper	$ 884,000,000	$ 1,237,000,000
Other, including finance leases	42,000,000	42,000,000
Total short-term debt	1,715,000,000	2,775,000,000
Long-term debt
Other, including finance leases	59,000,000	66,000,000
Total long-term debt	31,053,000,000	28,155,000,000
$500 million, 0.613% Notes due March 2024
Short-term debt
Current maturities	0	500,000,000
Long-term debt
Gross value	$ 500,000,000
Interest Rate	0.613%
$790 million, 3.500% Notes due June 2024
Short-term debt
Current maturities	$ 789,000,000	996,000,000
Long-term debt
Gross value	$ 790,000,000
Interest Rate	3.50%
$900 million, 3.250% Notes due April 2025 (2)
Long-term debt
Long-term debt	$ 881,000,000	882,000,000
Gross value	$ 900,000,000
Interest Rate	3.25%
$1,216 million, 4.125% Notes due November 2025 (1)
Long-term debt
Long-term debt	$ 1,214,000,000	2,197,000,000
Gross value	$ 1,216,000,000
Interest Rate	4.125%
$1,284 million, 4.500% Notes due February 2026 (1)
Long-term debt
Long-term debt	$ 1,285,000,000	1,502,000,000
Gross value	$ 1,284,000,000
Interest Rate	4.50%
$550 million, 1.250% Notes due March 2026 (1)
Long-term debt
Long-term debt	$ 549,000,000	798,000,000
Gross value	$ 550,000,000
Interest Rate	1.25%
$700 million, 5.685% Notes due March 2026
Long-term debt
Long-term debt	$ 698,000,000	698,000,000
Gross value	$ 700,000,000
Interest Rate	5.685%
$1,500 million, 3.400% Notes due March 2027
Long-term debt
Long-term debt	$ 1,454,000,000	1,450,000,000
Gross value	$ 1,500,000,000
Interest Rate	3.40%
$259 million, 7.875% Debentures due May 2027
Long-term debt
Long-term debt	$ 259,000,000	259,000,000
Gross value	$ 259,000,000
Interest Rate	7.875%
$600 million, 3.050% Notes due October 2027
Long-term debt
Long-term debt	$ 598,000,000	597,000,000
Gross value	$ 600,000,000
Interest Rate	3.05%
$3,800 million, 4.375% Notes due October 2028
Long-term debt
Long-term debt	$ 3,788,000,000	3,787,000,000
Gross value	$ 3,800,000,000
Interest Rate	4.375%
$1,000 million, 5.000% Notes due May 2029
Long-term debt
Long-term debt	$ 994,000,000	0
Gross value	$ 1,000,000,000
Interest Rate	5.00%
$1,400 million, 2.400% Notes due March 2030 (1)
Long-term debt
Long-term debt	$ 1,394,000,000	1,493,000,000
Gross value	$ 1,400,000,000
Interest Rate	2.40%
$1,500 million, 2.375% Notes due March 2031 (2)
Long-term debt
Long-term debt	$ 1,382,000,000	1,397,000,000
Gross value	$ 1,500,000,000
Interest Rate	2.375%
$750 million, 5.125% Notes due May 2031
Long-term debt
Long-term debt	$ 745,000,000	0
Gross value	$ 750,000,000
Interest Rate	5.125%
$45 million, 8.080% Step Down Notes due January 2033 (3)
Long-term debt
Long-term debt	$ 45,000,000	45,000,000
Gross value	$ 45,000,000
Interest Rate	8.08%		8.08%
$800 million, 5.400% Notes due March 2033
Long-term debt
Long-term debt	$ 794,000,000	794,000,000
Gross value	$ 800,000,000
Interest Rate	5.40%
$1,250 million, 5.250% Notes due February 2034
Long-term debt
Long-term debt	$ 1,242,000,000	0
Gross value	$ 1,250,000,000
Interest Rate	5.25%
$190 million, 6.150% Notes due November 2036
Long-term debt
Long-term debt	$ 190,000,000	190,000,000
Gross value	$ 190,000,000
Interest Rate	6.15%
$2,200 million, 4.800% Notes due August 2038
Long-term debt
Long-term debt	$ 2,193,000,000	2,193,000,000
Gross value	$ 2,200,000,000
Interest Rate	4.80%
$750 million, 3.200% Notes due March 2040
Long-term debt
Long-term debt	$ 744,000,000	744,000,000
Gross value	$ 750,000,000
Interest Rate	3.20%
$121 million, 5.875% Notes due March 2041
Long-term debt
Long-term debt	$ 119,000,000	119,000,000
Gross value	$ 121,000,000
Interest Rate	5.875%
$448 million, 6.125% Notes due November 2041
Long-term debt
Long-term debt	$ 487,000,000	487,000,000
Gross value	$ 448,000,000
Interest Rate	6.125%
$317 million, 5.375% Notes due February 2042
Long-term debt
Long-term debt	$ 315,000,000	315,000,000
Gross value	$ 317,000,000
Interest Rate	5.375%
$1,500 million, 4.800% Notes due July 2046
Long-term debt
Long-term debt	$ 1,467,000,000	1,467,000,000
Gross value	$ 1,500,000,000
Interest Rate	4.80%
$1,000 million, 3.875% Notes due October 2047
Long-term debt
Long-term debt	$ 989,000,000	989,000,000
Gross value	$ 1,000,000,000
Interest Rate	3.875%
$3,000 million, 4.900% Notes due December 2048
Long-term debt
Long-term debt	$ 2,970,000,000	2,970,000,000
Gross value	$ 3,000,000,000
Interest Rate	4.90%
$1,250 million, 3.400% Notes due March 2050
Long-term debt
Long-term debt	$ 1,237,000,000	1,237,000,000
Gross value	$ 1,250,000,000
Interest Rate	3.40%
$1,500 million, 3.400% Notes due March 2051
Long-term debt
Long-term debt	$ 1,479,000,000	1,479,000,000
Gross value	$ 1,500,000,000
Interest Rate	3.40%
$1,500 million, 5.600% Notes due February 2054
Long-term debt
Long-term debt	$ 1,482,000,000	$ 0
Gross value	$ 1,500,000,000
Interest Rate	5.60%