Other Financial Data - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ 131
Total other comprehensive income (loss), net of tax	(5)	$ (156)	$ 67
Balance at end of period	739	131
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(539)	(384)	(360)
Other comprehensive income (loss) before reclassification adjustment	61	(156)	(30)
Tax benefit (expense)	(4)	1	6
Total other comprehensive income (loss), net of tax	57	(155)	(24)
Balance at end of period	(482)	(539)	(384)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	0	0	0
Other comprehensive income (loss) before reclassification adjustment	(12)	0	0
Tax benefit (expense)	0	0	0
Total other comprehensive income (loss), net of tax	(12)	0	0
Balance at end of period	(12)	0	0
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,996)	(1,995)	(2,086)
Other comprehensive income (loss) before reclassification adjustment	(130)	(76)	37
Tax benefit (expense)	34	18	(7)
Other comprehensive income (loss) before reclassification adjustment, net of tax	(96)	(58)	30
Tax expense	(16)	(21)	(20)
Reclassification adjustment into earnings, net of tax	46	57	61
Total other comprehensive income (loss), net of tax	(50)	(1)	91
Balance at end of period	(2,046)	(1,996)	(1,995)
Reclassification adjustment - Actuarial net losses into Other income (expense)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment	61	80	89
Reclassification adjustment - Prior service benefits into Other income (expense)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment	1	(2)	(8)
Total Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(2,535)	(2,379)	(2,446)
Total other comprehensive income (loss), net of tax	(5)	(156)	67
Balance at end of period	$ (2,540)	$ (2,535)	$ (2,379)