Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Shareholders' Equity Activity Summarization [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 10,246	$ 10,547	$ 10,409	$ 10,352	$ 10,046	$ 9,682	$ 10,246	$ 10,352	$ 10,548	$ 9,433
Net income (loss)	20	480	203	580	713	609	703	1,902
Dividends, Common Stock	(144)	(145)	(147)	(150)	(151)	(151)
Stock Repurchased During Period, Value	(252)	(252)	(252)	(198)	(251)	(250)
Stock plans	(74)	(60)	(58)	(70)	(57)	(41)
Other	(1)	(8)	5	1	(4)	0
Other comprehensive income (loss), net of income taxes	2	3	(6)	3	0	0	(1)	3
Common Shares
Shareholders' Equity Activity Summarization [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,659	2,661	2,661	2,662	2,663	2,662	2,659	2,662	2,662	2,663
Net income (loss)	0	0	0	0	0	0
Dividends, Common Stock	0	0	0	0	0	0
Stock Repurchased During Period, Value	0	0	0	0	0	0
Stock plans	(2)	0	(1)	(1)	(1)	(1)
Other	0	0	0	0	0	0
Other comprehensive income (loss), net of income taxes	0	0	0	0	0	0
Paid-in Capital in Excess of Par Value
Shareholders' Equity Activity Summarization [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	74	31	59	38	0	0	74	38	79	63
Net income (loss)	0	0	0	0	0	0
Dividends, Common Stock	0	0	0	0	0	0
Stock Repurchased During Period, Value	0	0	0	0	0	0
Stock plans	(43)	(28)	(24)	(38)	0	(63)
Other	0	0	4	0	0	0
Other comprehensive income (loss), net of income taxes	0	0	0	0	0	0
Treasury Stock, Common
Shareholders' Equity Activity Summarization [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,766)	(6,547)	(6,383)	(5,940)	(5,781)	(5,682)	(6,766)	(5,940)	(6,214)	(5,540)
Net income (loss)	0	0	0	0	0	0
Dividends, Common Stock	0	0	0	0	0	0
Stock Repurchased During Period, Value	252	252	252	198	251	250
Stock plans	(33)	(88)	(83)	(39)	(152)	(108)
Other	0	0	0	0	0	0
Other comprehensive income (loss), net of income taxes	0	0	0	0	0	0
Retained Earnings
Shareholders' Equity Activity Summarization [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	14,590	14,716	14,389	13,865	13,450	12,988	14,590	13,865	14,332	12,536
Net income (loss)	18	472	204	571	709	606
Dividends, Common Stock	(144)	(145)	(147)	(150)	(151)	(151)
Stock Repurchased During Period, Value	0	0	0	0	0	0
Stock plans	0	0	0	(6)	(96)	(3)
Other	0	0	0	0	0	0
Other comprehensive income (loss), net of income taxes	0	0	0	0	0	0
Accumulated Other Comprehensive Income (Loss)
Shareholders' Equity Activity Summarization [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(354)	(356)	(359)	(329)	(332)	(332)	(354)	(329)	(353)	(331)
Net income (loss)	0	0	0	0	0	0
Dividends, Common Stock	0	0	0	0	0	0
Stock Repurchased During Period, Value	0	0	0	0	0	0
Stock plans	0	0	0	0	0	0
Other	0	0	0	0	0	0
Other comprehensive income (loss), net of income taxes	2	3	(6)	3	0	(1)
Noncontrolling Interest in Consolidated Subsidiaries
Shareholders' Equity Activity Summarization [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	43	42	42	56	46	46	$ 43	$ 56	$ 42	$ 42
Net income (loss)	2	8	(1)	9	4	3
Cash dividends	0	0	0	0	0	0
Stock Repurchased During Period, Value	0	0	0	0	0	0
Stock plans	0	0	0	0	0	0
Other	(1)	(8)	1	1	(4)	0
Other comprehensive income (loss), net of income taxes	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1