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Goodwill and Acquired Intangibles
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangibles Goodwill and Acquired Intangibles
Changes in the carrying amount of goodwill by business segment were as follows (in millions):
AeronauticsMFCRMSSpaceTotal
Balance at December 31, 2022$196 $2,083 $6,726 $1,775 $10,780 
Other— 3 15 1 19 
Balance at December 31, 2023196 2,086 6,741 1,776 10,799 
Acquisitions— — — 298 298 
Other— (1)(29)— (30)
Balance at December 31, 2024$196 $2,085 $6,712 $2,074 $11,067 
The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (useful life in years, $ in millions):
 20242023
Estimated Useful LivesGross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Finite-Lived:
Customer programs
3 - 20
$3,186 $(2,128)$1,058 $3,186 $(1,897)$1,289 
Customer relationships
5 - 10
94 (91)3 94 (84)10 
Other
5 - 10
156 (39)117 72 (46)26 
Total finite-lived intangibles3,436 (2,258)1,178 3,352 (2,027)1,325 
Indefinite-Lived:
Trademark837 — 837 887 — 887 
Total acquired intangibles$4,273 $(2,258)$2,015 $4,239 $(2,027)$2,212 
Acquired finite-lived intangible assets are amortized to expense primarily on a straight-line basis over their estimated useful lives.
Amortization expense for acquired finite-lived intangible assets was $247 million for both 2024 and 2023 and $248 million in 2022. Estimated future amortization expense is as follows: $241 million in 2025; $174 million in 2026; $173 million in 2027; $168 million in 2028; and $159 million in 2029.