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Long-Term Debt (Summarized Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Long-term Debt [Line Items]    
Debt issuance costs $ (42) $ (55)
Long-term debt 20,538 24,406
XTO Energy Inc. [Member]    
Long-term Debt [Line Items]    
Debt instrument, unamortized premium 97 102
Combined Exxon Mobil And Affiliates [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Other long-term debt 102 162
Combined Exxon Mobil And Affiliates [Member] | Other Foreign Currency Obligations [Member]    
Long-term Debt [Line Items]    
Other long-term debt 38 34
1.819% Notes Due 2019 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent   $ 1,750
Interest rate   1.819%
Debt maturity   Mar. 15, 2019
1.708% Notes Due 2019 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent   $ 1,250
Interest rate   1.708%
Debt maturity   Mar. 01, 2019
Floating-Rate Notes Due 2019 (Issued 2014) [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent   $ 500
Debt maturity   Mar. 15, 2019
Floating-Rate Notes Due 2019 (Issued 2016) [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent   $ 250
Debt maturity   Mar. 01, 2019
1.912% Notes Due 2020 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,500 $ 1,500
Interest rate 1.912%  
Debt maturity Mar. 06, 2020 Mar. 06, 2020
2.222% Notes Due 2021 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,500 $ 2,500
Interest rate 2.222%  
Debt maturity Mar. 01, 2021 Mar. 01, 2021
2.397% Notes Due 2022 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,150 $ 1,150
Interest rate 2.397%  
Debt maturity Mar. 06, 2022 Mar. 06, 2022
Floating-Rate Notes Due 2022 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 500 $ 500
Debt maturity Mar. 06, 2022 Mar. 06, 2022
Average effective interest rate [1] 2.502%  
2.726% Notes Due 2023 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,250 $ 1,250
Interest rate 2.726%  
Debt maturity Mar. 01, 2023 Mar. 01, 2023
3.176% Notes Due 2024 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,000 $ 1,000
Interest rate 3.176%  
Debt maturity Mar. 15, 2024 Mar. 15, 2024
2.709% Notes Due 2025 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,750 $ 1,750
Interest rate 2.709%  
Debt maturity Mar. 06, 2025 Mar. 06, 2025
3.043% Notes Due 2026 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,500 $ 2,500
Interest rate 3.043%  
Debt maturity Mar. 01, 2026 Mar. 01, 2026
3.567% Notes Due 2045 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,000 $ 1,000
Interest rate 3.567%  
Debt maturity Mar. 06, 2045 Mar. 06, 2045
4.114% Notes Due 2046 [Member] | Exxon Mobil Corporation [Member] | Other U.S. Dollar Obligations [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,500 $ 2,500
Interest rate 4.114%  
Debt maturity Mar. 01, 2046 Mar. 01, 2046
6.100% Senior Notes Due 2036 [Member] | XTO Energy Inc. [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 195 $ 195
Interest rate 6.10%  
Debt maturity Apr. 01, 2036 Apr. 01, 2036
6.750% Senior Notes Due 2037 [Member] | XTO Energy Inc. [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 299 $ 302
Interest rate 6.75%  
Debt maturity Aug. 01, 2037 Aug. 01, 2037
6.375% Senior Notes Due 2038 [Member] | XTO Energy Inc. [Member]    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 230 $ 232
Interest rate 6.375%  
Debt maturity Jun. 15, 2038 Jun. 15, 2038
8.625% Debentures Due 2021 [Member] | Mobil Corporation [Member]    
Long-term Debt [Line Items]    
Other long-term debt $ 250 $ 250
Interest rate 8.625%  
Debt maturity Aug. 15, 2021 Aug. 15, 2021
Industrial Revenue Bonds Due 2019-2051 [Member] | Combined Exxon Mobil And Affiliates [Member]    
Long-term Debt [Line Items]    
Other long-term debt $ 2,513 $ 2,559
Debt instrument, maturity date range, start Jun. 01, 2020 Nov. 01, 2019
Debt instrument, maturity date range, end Dec. 01, 2051 Dec. 01, 2051
Average effective interest rate [1] 1.334%  
Capital Lease Obligations [Member] | Combined Exxon Mobil And Affiliates [Member]    
Long-term Debt [Line Items]    
Average effective interest rate [1] 9.44%  
Long-term debt $ 1,303 $ 1,327
[1]

Average effect ive interest rate for debt and average imputed interest rate for capitalized leases at December 31, 2018.