Debt (Long-term Debt Instruments) (Details) - USD ($)	1 Months Ended		6 Months Ended
	May 31, 2024	Mar. 31, 2024	Jun. 30, 2024	Mar. 15, 2024	Feb. 28, 2024	Jan. 31, 2024	Dec. 31, 2023
Debt Instrument
Finance leases			$ 224,000,000				$ 192,000,000
Total debt			12,889,000,000				11,518,000,000
Less short-term portion			(1,369,000,000)				(1,465,000,000)
Total long-term debt			11,520,000,000				10,053,000,000
Repurchase facility (terminated in 2024) | Repurchase facility
Debt Instrument
Long-term debt			0				100,000,000
Accounts receivable securitization facility expiring 2025 | Line of Credit
Debt Instrument
Maximum borrowing capacity	$ 1,500,000,000
Long-term debt			1,289,000,000				1,300,000,000
Borrowing capacity, net of letters of credit			$ 147,000,000
Interest rate at June 30, 2024			6.30%
Average month-end debt outstanding			$ 1,156,000,000
Weighted-average interest rate on average debt outstanding			6.30%
Maximum month-end debt outstanding			$ 1,290,000,000
Debt instrument, extension period	364 days
Collateral amount			1,437,000,000
$4.25 billion ABL facility expiring 2027 | Line of Credit
Debt Instrument
Maximum borrowing capacity			4,250,000,000
Long-term debt			1,571,000,000				1,261,000,000
Borrowing capacity, net of letters of credit			2,653,000,000
Letters of credit			$ 18,000,000
Interest rate at June 30, 2024			6.50%
Average month-end debt outstanding			$ 1,354,000,000
Weighted-average interest rate on average debt outstanding			6.50%
Maximum month-end debt outstanding			$ 1,578,000,000
Term loan facility expiring 2031
Debt Instrument
Long-term debt			$ 988,000,000				945,000,000
Annual repayment rate			1.00%
Long-term debt, gross					$ 1,000,000,000.000	$ 948,000,000
5 1/2 percent Senior Notes due 2027 | Senior notes
Debt Instrument
Stated interest rate			5.50%
Long-term debt			$ 499,000,000				498,000,000
3 7/8 percent Senior Secured Notes due 2027 | Senior notes
Debt Instrument
Stated interest rate			3.875%
Long-term debt			$ 746,000,000				745,000,000
4 7/8 percent Senior Notes due 2028 | Senior notes
Debt Instrument
Stated interest rate			4.875%
Long-term debt			$ 1,666,000,000				1,665,000,000
6 percent Senior Secured Notes due 2029 | Senior notes
Debt Instrument
Stated interest rate			6.00%
Long-term debt			$ 1,489,000,000				1,488,000,000
5 1/4 percent Senior Notes due 2030 | Senior notes
Debt Instrument
Stated interest rate			5.25%
Long-term debt			$ 745,000,000				745,000,000
4 percent Senior Notes due 2030 | Senior notes
Debt Instrument
Stated interest rate			4.00%
Long-term debt			$ 745,000,000				744,000,000
3 7/8 percent Senior Notes due 2031 | Senior notes
Debt Instrument
Stated interest rate			3.875%
Long-term debt			$ 1,092,000,000				1,091,000,000
3 3/4 percent Senior Notes due 2032 | Senior notes
Debt Instrument
Stated interest rate			3.75%
Long-term debt			$ 745,000,000				744,000,000
6 1/8 percent Senior Notes due 2034 | Senior notes
Debt Instrument
Stated interest rate			6.125%	6.125%
Long-term debt			$ 1,090,000,000				$ 0
Debt instrument, face amount				$ 1,100,000,000
6 1/8 percent Senior Notes due 2034 | Senior notes | Subsidiaries
Debt Instrument
Debt instrument, face amount		$ 1,100,000,000
6 1/8 percent Senior Notes due 2034 | Senior notes | Redemption Period One | Subsidiaries
Debt Instrument
Debt instrument, redemption price, percentage		103.063%
6 1/8 percent Senior Notes due 2034 | Senior notes | Redemption Period Two | Subsidiaries
Debt Instrument
Debt instrument, redemption price, percentage		100.00%
6 1/8 percent Senior Notes due 2034 | Senior notes | Redemption Period Three | Subsidiaries
Debt Instrument
Debt instrument, redemption price, percentage		106.125%
6 1/8 percent Senior Notes due 2034 | Senior notes | Redemption Period Four | Subsidiaries
Debt Instrument
Debt instrument, redemption price, percentage		40.00%
6 1/8 percent Senior Notes due 2034 | Senior notes | Redemption Period Five | Subsidiaries
Debt Instrument
Debt instrument, redemption price, percentage		101.00%
Term loan facility | Line of Credit
Debt Instrument
Borrowing capacity, net of letters of credit			$ 0
Interest rate at June 30, 2024			7.10%
Average month-end debt outstanding			$ 991,000,000
Weighted-average interest rate on average debt outstanding			7.10%
Maximum month-end debt outstanding			$ 1,000,000,000
4 7/8 percent Senior Notes due 2028, one | Senior notes
Debt Instrument
Long-term debt			1,662,000,000
4 7/8 percent Senior Notes due 2028, two | Senior notes
Debt Instrument
Long-term debt			$ 4,000,000