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Borrowings and Lines of Credit (Long-Term Debt) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Debt Instrument [Line Items]        
Document Fiscal Year Focus 2018 2018    
Proceeds from Issuance of Debt $ 11,000      
Debt Instrument, Interest Rate, Stated Percentage     3.10%  
Debt Instrument, Maturity Year Date 2021 2021    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Project financing obligations $ 287   $ 158  
Total principal long-term debt 44,416   27,118  
Other debt (including capitalized leases) 287   195  
Other (fair market value adjustments, discounts and debt issuance costs) (348)   (25)  
Total long-term debt 44,068   27,093  
Less: current portion 2,876   2,104  
Long-term debt, net of current portion 41,192   24,989  
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 2,876      
Long Term Debt Maturities Repayments Of Principal In Year Two 3,436      
Long Term Debt Maturities Repayments Of Principal In Year Three 4,151      
Long Term Debt Maturities Repayments Of Principal In Year Four 3,910      
Long Term Debt Maturities Repayments Of Principal In Year Five 3,523      
Long Term Debt Maturities Repayments Of Principal After Year Five 26,520      
Notes 6.800% Due 2018 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount $ 0   $ 99  
Debt Instrument, Interest Rate, Stated Percentage     6.80%  
Debt Instrument, Maturity Year Date 2018 2018    
EURIBOR plus 0.800% floating rate notes due 2018 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [1] $ 0   $ 890  
Debt Instrument, Maturity Year Date 2018 2018    
Debt Instrument, Call Feature The three-month EURIBOR rate as of December 31, 2018 was approximately -0.309%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation. The three-month EURIBOR rate as of December 31, 2018 was approximately -0.309%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.    
Junior subordinated notes 1.778% due 2018 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount $ 0   $ 1,100  
Debt Instrument, Interest Rate, Stated Percentage     1.778%  
Debt Instrument, Maturity Year Date 2018 2018    
LIBOR plus 0.350% floating rate notes due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [2] $ 350   $ 350  
Debt Instrument, Maturity Year Date 2019 2019    
Debt Instrument, Call Feature The three-month LIBOR rate as of December 31, 2018 was approximately 2.808%. The three-month LIBOR rate as of December 31, 2018 was approximately 2.808%.    
Notes 1.500% Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 650   $ 650  
Debt Instrument, Interest Rate, Stated Percentage     1.50%  
Debt Instrument, Maturity Year Date 2019 2019    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 1.950% Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 300   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     1.95%  
Debt Instrument, Maturity Year Date 2019 2019    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
EURIBOR plus 0.15% floating rate notes due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date     Nov. 13, 2017 Nov. 13, 2017
Proceeds from Issuance of Debt | € [5]       € 750
Debt Instrument, Carrying Amount [1] $ 858   $ 890  
Debt Instrument, Maturity Year Date 2019 2019    
Debt Instrument, Call Feature The three-month EURIBOR rate as of December 31, 2018 was approximately -0.309%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation. The three-month EURIBOR rate as of December 31, 2018 was approximately -0.309%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.    
Notes 5.250% Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 300   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     5.25%  
Debt Instrument, Maturity Year Date 2019 2019    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Notes 8.875% Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount $ 271   $ 271  
Debt Instrument, Interest Rate, Stated Percentage     8.875%  
Debt Instrument, Maturity Year Date 2019 2019    
Notes 4.875% Due 2020 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 171   $ 171  
Debt Instrument, Interest Rate, Stated Percentage     4.875%  
Debt Instrument, Maturity Year Date 2020 2020    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 4.500% Due 2020 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 1,250   $ 1,250  
Debt Instrument, Interest Rate, Stated Percentage     4.50%  
Debt Instrument, Maturity Year Date 2020 2020    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 1.900% Due 2020 [Member]        
Debt Instrument [Line Items]        
Proceeds from Issuance of Debt [6]     $ 1,000  
Debt Instrument, Carrying Amount [3] $ 1,000   $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage     1.90%  
Debt Instrument, Maturity Year Date 2020 2020    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
EURIBOR plus 0.20% floating rate notes due 2020 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date May 18, 2018 May 18, 2018    
Proceeds from Issuance of Debt | € [7]   € 750    
Debt Instrument, Carrying Amount [1] $ 858   $ 0  
Debt Instrument, Maturity Year Date 2020 2020    
Debt Instrument, Call Feature The three-month EURIBOR rate as of December 31, 2018 was approximately -0.309%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation. The three-month EURIBOR rate as of December 31, 2018 was approximately -0.309%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.    
Notes 8.750% Due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount $ 250   $ 250  
Debt Instrument, Interest Rate, Stated Percentage     8.75%  
Debt Instrument, Maturity Year Date 2021 2021    
Notes 3.100% Due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 250   $ 0  
Notes 3.350% due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Aug. 16, 2018 Aug. 16, 2018    
Proceeds from Issuance of Debt [8] $ 1,000      
Debt Instrument, Carrying Amount [3] $ 1,000   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     3.35%  
Debt Instrument, Maturity Year Date 2021 2021    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
LIBOR plus 0.650% floating rate notes due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Aug. 16, 2018 Aug. 16, 2018    
Proceeds from Issuance of Debt [8] $ 750      
Debt Instrument, Carrying Amount [2],[3] $ 750   $ 0  
Debt Instrument, Maturity Year Date 2021 2021    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. The three-month LIBOR rate as of December 31, 2018 was approximately 2.808%. We may redeem these notes at our option pursuant to their terms. The three-month LIBOR rate as of December 31, 2018 was approximately 2.808%.    
Notes 1.950% Due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 750   $ 750  
Debt Instrument, Interest Rate, Stated Percentage     1.95%  
Debt Instrument, Maturity Year Date 2021 2021    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 1.125% Due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 1,088   $ 1,127  
Debt Instrument, Interest Rate, Stated Percentage     1.125%  
Debt Instrument, Maturity Year Date 2021 2021    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 2.300% Due 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date     May 04, 2017 May 04, 2017
Proceeds from Issuance of Debt [6]     $ 500  
Debt Instrument, Carrying Amount [3] $ 500   $ 500  
Debt Instrument, Interest Rate, Stated Percentage     2.30%  
Debt Instrument, Maturity Year Date 2022 2022    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 2.800% Due 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 1,100   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     2.80%  
Debt Instrument, Maturity Year Date 2022 2022    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Notes 3.100% Due 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 2,300   $ 2,300  
Debt Instrument, Interest Rate, Stated Percentage     3.10%  
Debt Instrument, Maturity Year Date 2022 2022    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 1.250% due 2023 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 858   $ 890  
Debt Instrument, Interest Rate, Stated Percentage     1.25%  
Debt Instrument, Maturity Year Date 2023 2023    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 3.650% Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Aug. 16, 2018 Aug. 16, 2018    
Proceeds from Issuance of Debt [8] $ 2,250      
Debt Instrument, Carrying Amount [3] $ 2,250   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     3.65%  
Debt Instrument, Maturity Year Date 2023 2023    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 3.700% Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 400   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     3.70%  
Debt Instrument, Maturity Year Date 2023 2023    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Notes 2.800% Due 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date     May 04, 2017 May 04, 2017
Proceeds from Issuance of Debt [6]     $ 800  
Debt Instrument, Carrying Amount [3] $ 800   $ 800  
Debt Instrument, Interest Rate, Stated Percentage     2.80%  
Debt Instrument, Maturity Year Date 2024 2024    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 3.200% Due 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 950   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     3.20%  
Debt Instrument, Maturity Year Date 2024 2024    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Notes 1.150% Due 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date May 18, 2018 May 18, 2018    
Proceeds from Issuance of Debt | € [7]   € 750    
Debt Instrument, Carrying Amount [3] $ 858   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     1.15%  
Debt Instrument, Maturity Year Date 2024 2024    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 3.950% Due 2025 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Aug. 16, 2018 Aug. 16, 2018    
Proceeds from Issuance of Debt [8] $ 1,500      
Debt Instrument, Carrying Amount [3] $ 1,500   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     3.95%  
Debt Instrument, Maturity Year Date 2025 2025    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 1.875% Due 2026 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 573   $ 593  
Debt Instrument, Interest Rate, Stated Percentage     1.875%  
Debt Instrument, Maturity Year Date 2026 2026    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 2.650% Due 2026 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 1,150   $ 1,150  
Debt Instrument, Interest Rate, Stated Percentage     2.65%  
Debt Instrument, Maturity Year Date 2026 2026    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 3.125% Due 2027 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date     May 04, 2017 May 04, 2017
Proceeds from Issuance of Debt [6]     $ 1,100  
Debt Instrument, Carrying Amount [3] $ 1,100   $ 1,100  
Debt Instrument, Interest Rate, Stated Percentage     3.125%  
Debt Instrument, Maturity Year Date 2027 2027    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 3.500% Due 2027 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 1,300   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     3.50%  
Debt Instrument, Maturity Year Date 2027 2027    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Notes 7.100% Due 2027 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount $ 141   $ 141  
Debt Instrument, Interest Rate, Stated Percentage     7.10%  
Debt Instrument, Maturity Year Date 2027 2027    
Notes 6.700% Due 2028 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount $ 400   $ 400  
Debt Instrument, Interest Rate, Stated Percentage     6.70%  
Debt Instrument, Maturity Year Date 2028 2028    
Notes 4.125% Due 2028 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Aug. 16, 2018 Aug. 16, 2018    
Proceeds from Issuance of Debt [8] $ 3,000      
Debt Instrument, Carrying Amount [3] $ 3,000   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     4.125%  
Debt Instrument, Maturity Year Date 2028 2028    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 7.500% Due 2029 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 550   $ 550  
Debt Instrument, Interest Rate, Stated Percentage     7.50%  
Debt Instrument, Maturity Year Date 2029 2029    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 2.150% Due 2030 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date May 18, 2018 May 18, 2018    
Proceeds from Issuance of Debt | € [7]   € 500    
Debt Instrument, Carrying Amount [3] $ 573   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     2.15%  
Debt Instrument, Maturity Year Date 2030 2030    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 5.400% Due 2035 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 600   $ 600  
Debt Instrument, Interest Rate, Stated Percentage     5.40%  
Debt Instrument, Maturity Year Date 2035 2035    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 6.050% Due 2036 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 600   $ 600  
Debt Instrument, Interest Rate, Stated Percentage     6.05%  
Debt Instrument, Maturity Year Date 2036 2036    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 6.800% Due 2036 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 134   $ 134  
Debt Instrument, Interest Rate, Stated Percentage     6.80%  
Debt Instrument, Maturity Year Date 2036 2036    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 7.000% Due 2038 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount $ 159   $ 159  
Debt Instrument, Interest Rate, Stated Percentage     7.00%  
Debt Instrument, Maturity Year Date 2038 2038    
Notes 6.125% Due 2038 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 1,000   $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage     6.125%  
Debt Instrument, Maturity Year Date 2038 2038    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 4.450% Due 2038 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Aug. 16, 2018 Aug. 16, 2018    
Proceeds from Issuance of Debt [8] $ 750      
Debt Instrument, Carrying Amount [3] $ 750   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     4.45%  
Debt Instrument, Maturity Year Date 2038 2038    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 5.700% Due 2040 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 1,000   $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage     5.70%  
Debt Instrument, Maturity Year Date 2040 2040    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 4.500% Due 2042 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 3,500   $ 3,500  
Debt Instrument, Interest Rate, Stated Percentage     4.50%  
Debt Instrument, Maturity Year Date 2042 2042    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 4.800% Due 2043 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 400   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     4.80%  
Debt Instrument, Maturity Year Date 2043 2043    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Notes 4.150% Due 2045 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 850   $ 850  
Debt Instrument, Interest Rate, Stated Percentage     4.15%  
Debt Instrument, Maturity Year Date 2045 2045    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 3.750% Due 2046 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [3] $ 1,100   $ 1,100  
Debt Instrument, Interest Rate, Stated Percentage     3.75%  
Debt Instrument, Maturity Year Date 2046 2046    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 4.050% Due 2047 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date     May 04, 2017 May 04, 2017
Proceeds from Issuance of Debt [6]     $ 600  
Debt Instrument, Carrying Amount [3] $ 600   $ 600  
Debt Instrument, Interest Rate, Stated Percentage     4.05%  
Debt Instrument, Maturity Year Date 2047 2047    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
Notes 4.350% Due 2047 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Carrying Amount [4] $ 1,000   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     4.35%  
Debt Instrument, Maturity Year Date 2047 2047    
Debt Instrument, Call Feature Rockwell Collins debt which remained outstanding following the Merger. Rockwell Collins debt which remained outstanding following the Merger.    
Notes 4.625% Due 2048 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Aug. 16, 2018 Aug. 16, 2018    
Proceeds from Issuance of Debt [5] $ 1,750      
Debt Instrument, Carrying Amount [3] $ 1,750   $ 0  
Debt Instrument, Interest Rate, Stated Percentage     4.625%  
Debt Instrument, Maturity Year Date 2048 2048    
Debt Instrument, Call Feature We may redeem these notes at our option pursuant to their terms. We may redeem these notes at our option pursuant to their terms.    
[1] The three-month EURIBOR rate as of December 31, 2018 was approximately -0.309%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.
[2] The three-month LIBOR rate as of December 31, 2018 was approximately 2.808%.
[3] We may redeem these notes at our option pursuant to their terms.
[4] 4Rockwell Collins debt which remained outstanding following the Merger.
[5] 2The net proceeds from these debt issuances were used to fund the repayment of commercial paper and for other general corporate purposes.
[6] 4The net proceeds received from these debt issuances were used to fund the repayment at maturity of our 1.800% notes due 2017, representing $1.5 billion in aggregate principal and other general corporate purposes.
[7] 3The net proceeds received from these debt issuances were used for general corporate purposes.
[8] 1The net proceeds received from these debt issuances were used to partially finance the cash consideration portion of the purchase price for Rockwell Collins and fees, expenses and other amounts related to the acquisition of Rockwell Collins.