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Goodwill and Acquired Intangibles
 12 Months Ended
Dec. 31, 2023
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, 2021$187 $2,090 $6,759 $1,777 $10,813 
Acquisitions— — 3 — 3 
Other9 (7)(36)(2)(36)
Balance at December 31, 2022196 2,083 6,726 1,775 10,780 
Other— 3 15 1 19 
Balance at December 31, 2023$196 $2,086 $6,741 $1,776 $10,799 
The gross carrying amounts and accumulated amortization of our acquired intangible assets consisted of the following (useful life in years, $ in millions):
 20232022
Estimated Useful LivesGross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Finite-Lived:
Customer programs
9 - 20
$3,186 $(1,897)$1,289 $3,186 $(1,664)$1,522 
Customer relationships
4 - 10
94 (84)10 94 (78)16 
Other
3 - 10
72 (46)26 72 (38)34 
Total finite-lived intangibles3,352 (2,027)1,325 3,352 (1,780)1,572 
Indefinite-Lived:
Trademark887 — 887 887 — 887 
Total acquired intangibles$4,239 $(2,027)$2,212 $4,239 $(1,780)$2,459 
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, $248 million and $285 million in 2023, 2022 and 2021. Estimated future amortization expense is as follows: $244 million in 2024; $221 million in 2025; $154 million in 2026; $153 million in 2027; and $148 million in 2028.