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Risk Management (Tables)

12 Months Ended

Dec. 31, 2023

Risk Management [Abstract]

Summary of Capital Risk Management

Details of the Company’s capital management accounts as of December 31, 2022 and 2023 are as follows:

						2022				2023
						In millions of won
Total borrowings and debt securities		￦					120,605,365				133,631,830
Cash and cash equivalents							3,234,780				4,342,887
Net borrowings and debt securities							117,370,585				129,288,943
Total equity							42,000,256				37,264,750
Debt to equity ratio							279.45	%			346.95	%

Summary of Maximum Exposure to Credit Risk

Book values of the financial assets represent the maximum exposed amounts of the credit risk. Details of the Company’s level of maximum exposure to credit risk as of December 31, 2022 and 2023 are as follows:

						2022				2023
						In millions of won
Cash and cash equivalents		￦					3,234,780				4,342,887
Financial assets at fair value through profit or loss(*1)							3,610,408				2,590,228
Derivative assets (trading)							693,072				730,948
Financial assets at fair value through other comprehensive income (debt securities)							529				4,627
Financial assets at amortized cost							26,998				38,843
Loans							1,013,371				988,331
Long-term/short-term financial instruments							1,353,080				1,412,315
Derivative assets (applying hedge accounting)							324,952				269,446
Trade and other receivables							12,614,902				14,179,322
Financial guarantee contracts(*2)							3,776,060				4,399,189

(*1) Equity investments held by the Company are excluded.

(*2) Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.

For the year ended December 31, 2023, there are no financial assets and non-financial assets that were acquired through the exercise of the right of collateralized assets and reinforcement of credit arrangement.

Summary of Sensitivity Analysis for Actuarial Assumptions

A sensitivity analysis of defined benefit obligation assuming a 1% increase and decrease movements in the actuarial valuation assumptions as of December 31, 2022 and 2023 are as follows:

								2022								2023
Type		Accounts						1% Increase				1% Decrease				1% Increase				1% Decrease
								In millions of won
Future salary increases		Increase (decrease) in defined benefit obligation		￦					321,930				(283,658	)			392,392				(361,359	)
Discount rate		Increase (decrease) in defined benefit obligation							(289,229	)			337,033				(371,103	)			415,361

Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2022 and 2023 are ￦27,495 million and ￦29,993 million, respectively.

Summary of Principal Assumptions on Provisions Valuation

Changes in provisions due to movements in underlying assumptions as of December 31, 2022 and 2023 are as follows:

Type		Accounts		2022				2023
PCBs		Inflation rate			1.98	%			2.40	%
		Discount rate			1.92	%			2.12	%
Nuclear plants		Inflation rate			2.25	%			1.91	%
		Discount rate			2.48	%			2.76	%
Spent fuel		Inflation rate			2.93	%			1.91	%
		Discount rate			4.49	%			2.49	%
Radioactive waste		Inflation rate			3.06	%			3.89	%
		Discount rate			2.62	%			3.65	%

Summary of Sensitivity Analysis for Provisions Assumptions

A sensitivity analysis of provisions assuming a 0.1% increase and decrease movements in the underlying assumptions as of December 31, 2022 and 2023 are as follows:

								2022								2023
Type		Accounts						0.1%p Increase				0.1%p Decrease				0.1%p Increase				0.1%p Decrease
								In millions of won
Discount rate		PCBs		￦					(169	)			169				(123	)			123
		Nuclear plants							(474,432	)			491,360				(418,570	)			432,847
		Spent fuel							(54,330	)			56,453				(130,065	)			130,761
		Radioactive waste							(15,089	)			15,260				(13,538	)			13,683
Inflation rate		PCBs							169				(169	)			123				(123	)
		Nuclear plants							515,262				(498,258	)			458,047				(443,531	)
		Spent fuel							57,269				(55,191	)			133,931				(128,607	)
		Radioactive waste							14,190				(14,056	)			13,291				(13,174	)

Summary of Foreign Currency Risk

The Company undertakes transactions denominated in foreign currencies; consequently, exposures to exchange rate fluctuations arise. The carrying amounts of the Company’s foreign currency denominated monetary assets and monetary liabilities as of December 31, 2022 and 2023 are as follows:

			Assets								Liabilities
Type		2022				2023				2022				2023
		In thousands of foreign currencies
AED			5,610				24,441				25,597				18,143
AUD			4,448				4,310				299,663				299,795
BDT			7,514				2,260				—				—
BWP			824				777				—				—
EGP			—				1,665				1,162				1,941
CAD			89				—				595				—
CHF			—				—				500,158				499,930
CZK			—				—				153				—
EUR			1,976				12,259				41,073				81,744
GBP			—				75				31				—
HKD			—				—				4,014,446				5,079,189
IDR			598,697				25,567,281				1,323,840				2,118,580
INR			1,592,380				1,663,705				312,978				387,947
JOD			1,146				569				14				68,448
JPY			568,263				921,120				1,719,846				8,692,604
KZT			1,510				1,510				—				—
MGA			2,856,045				3,545,076				347,403				495,288
MMK			199,518				199,518				—				—
MYR			38,177				2,805				—				—
PHP			68,592				98,154				7,493				6,750
PKR			533,816				75,206,354				219,341				55,531
RUB			—				—				2,881				—
SAR			1,713				937				9,710				—
SEK			—				—				449,211				452,309
SGD			—				279				—				2,191
THB			—				—				389				—
USD			1,484,614				1,701,494				13,599,643				14,458,985
UYU			128,674				120,768				3,106				2,028
VND			1,184,670				848,242				4,495				—
ZAR			43,461				87,780				—				—

Summary of Sensitivity Analysis for Foreign Currency Exchange Rates

A sensitivity analysis on the Company’s income for the period assuming a 10% increase and decrease in currency exchange rates as of December 31, 2022 and 2023 are as follows:

						2022								2023
Type						10% Increase				10% Decrease				10% Increase				10% Decrease
						In millions of won
Increase (decrease) of profit before income tax		￦					(1,703,053	)			1,703,053				(1,828,308	)			1,828,308
Increase (decrease) of equity(*)							(1,703,053	)			1,703,053				(1,828,308	)			1,828,308

(*) The effect on the shareholders’ equity excluding the impact of income taxes.

Summary of Interest Rate Risk

The Company’s borrowings and debt securities with floating interest rates as of December 31, 2022 and 2023 are as follows:

Type						2022				2023
						In millions of won
Short-term borrowings		￦					3,154,972				4,435,420
Long-term borrowings							5,388,073				7,766,588
Debt securities							269,101				305,602
		￦					8,812,146				12,507,610

Summary of Sensitivity Analysis for Interest Rates

A sensitivity analysis on the Company’s long-term borrowings and debt securities assuming a 1% increase and decrease in interest for the years ended December 31, 2022 and 2023 are as follows:

						2022								2023
Type						1%p Increase				1%p Decrease				1%p Increase				1%p Decrease
						In millions of won
Increase (decrease) of profit before income tax		￦					(88,121	)			88,121				(125,076	)			125,076
Increase (decrease) of shareholder’s equity(*)							(88,121	)			88,121				(125,076	)			125,076

(*) The effect on the shareholders’ equity excluding the impact of income taxes.

Summary of Sensitivity Analysis for Electricity Rates

A sensitivity analysis on the Company’s income for the period assuming a 1% increase and decrease in price of electricity for the years ended December 31, 2022 and 2023 is as follows:

						2022								2023
Type						1% Increase				1% Decrease				1% Increase				1% Decrease
						In millions of won
Increase (decrease) of profit before income tax		￦					661,990				(661,990	)			829,548				(829,548	)
Increase (decrease) of shareholder’s equity(*)							661,990				(661,990	)			829,548				(829,548	)

(*) The effect on the equity excluding the impact of income taxes.

Summary of Maturity Analysis for Non Derivative Financial Liabilities

The expected maturities for non-derivative financial liabilities as of December 31, 2022 and 2023 in detail are as follows:

						2022
Type						Less than 1 year				1~2 Years				2~5 Years				More than 5 years				Total
						In millions of won
Borrowings and debt securities		￦					26,157,747				27,367,577				47,361,676				37,115,832				138,002,832
Lease liabilities							639,756				657,210				1,390,374				1,925,012				4,612,352
Trade and other payables(*1)							11,369,512				347,563				1,008,133				734,112				13,459,320
Financial guarantee contracts(*2)							105,091				54,310				3,495,437				121,222				3,776,060
		￦					38,272,106				28,426,660				53,255,620				39,896,178				159,850,564

						2023
Type						Less than 1 year				1~2 Years				2~5 Years				More than 5 years				Total
						In millions of won
Borrowings and debt securities		￦					50,878,929				29,046,036				42,420,850				32,778,830				155,124,645
Lease liabilities							641,525				588,850				1,309,996				1,694,729				4,235,100
Trade and other payables(*1)							8,477,209				364,443				833,394				589,004				10,264,050
Financial guarantee contracts(*2)							121,415				2,546,689				1,645,488				85,597				4,399,189
		￦					60,119,078				32,546,018				46,209,728				35,148,160				174,022,984

(*1) Excludes lease liabilities.

(*2) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2022 and 2023 are W67,240 and ￦49,992 million, respectively.

Summary of Maturity Analysis for Non Derivative Financial Assets

The expected maturities for non-derivative financial assets as of December 31, 2022 and 2023 in detail are as follows:

						2022
Type						Less than 1 year				1~5 Years				More than 5 years				Other (*)				Total
						In millions of won
Cash and cash equivalents		￦					3,234,780				—				—				—				3,234,780
Financial assets at fair value through other comprehensive income							—				—				—				502,829				502,829
Financial assets at amortized cost							16,762				10,231				5				—				26,998
Loans							132,877				411,594				502,050				—				1,046,521
Long-term/short-term financial instruments							666,758				—				25				686,297				1,353,080
Financial assets at fair value through profit or loss							3,181,791				645				3,535				523,537				3,709,508
Trade and other receivables							10,464,191				1,083,593				1,080,831				—				12,628,615
		￦					17,697,159				1,506,063				1,586,446				1,712,663				22,502,331
						2023
Type						Less than 1 year				1~5 Years				More than 5 years				Other (*)				Total
						In millions of won
Cash and cash equivalents		￦					4,342,887				—				—				—				4,342,887
Financial assets at fair value through other comprehensive income							—				—				—				502,443				502,443
Financial assets at amortized cost							28,905				9,938				—				—				38,843
Loans							139,168				465,666				411,100				8,872				1,024,806
Long-term/short-term financial instruments							578,578				22				23				833,692				1,412,315
Financial assets at fair value through profit or loss							2,054,021				1,381				6,523				649,360				2,711,285
Trade and other receivables							11,990,515				911,822				1,292,539				1,280				14,196,156
		￦					19,134,074				1,388,829				1,710,185				1,995,647				24,228,735

(*) The maturities cannot be presently determined.

Summary of Maturity Analysis for Derivative, Undiscounted Cash Flows

Derivative liabilities classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2022 and 2023 are as follows:

						2022
Type						Less than 1 year				1~2 Years				2~5 Years				More than 5 years				Total
						In millions of won
Net settlement
— Trading		￦					—				—				—				—				—
Gross settlement
— Trading and others							(42,663	)			(15,225	)			(171,130	)			(84,924	)			(313,942	)
— Hedging							—				(10,064	)			(5,176	)			(10,265	)			(25,505	)
		￦					(42,663)				(25,289	)			(176,306)				(95,189	)			(339,447	)
						2023
Type						Less than 1 year				1~2 Years				2~5 Years				More than 5 years				Total
						In millions of won
Net settlement
— Trading		￦					—				—				—				—				—
Gross settlement
— Trading and others							(22,571	)			(11,566	)			(201,590	)			(130,119	)			(365,846	)
— Hedging							—				(4,680	)			(13,243	)			(5,641	)			(23,564	)
		￦					(22,571	)			(16,246	)			(214,833	)			(135,760	)			(389,410	)

Summary of Maturity Analysis for Derivative Financial Assets

Derivative assets classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2022 and 2023 are as follows:

						2022
Type						Less than 1 year				1~2 Years				2~5 Years				More than 5 years				Total
						In millions of won
Net settlement
— Trading		￦					—				—				—				—				—
Gross settlement
— Trading							861,621				160,938				(352,657)				65,661				735,563
— Hedging							134,390				47,502				131,258				—				313,150
		￦					996,011				208,440				(221,399	)			65,661				1,048,713
						2023
Type						Less than 1 year				1~2 Years				2~5 Years				More than 5 years				Total
						In millions of won
Net settlement
— Trading		￦					—				—				—				—				—
Gross settlement
— Trading							257,073				123,132				169,004				145,728				694,937
— Hedging							78,769				61,031				131,687				—				271,487
		￦					335,842				184,163				300,691				145,728				966,424

Summary of Fair Value Measurement of Instruments

Fair value and book value of financial assets and liabilities as of December 31, 2022 and 2023 are as follows:

						2022								2023
Type						Book value				Fair value				Book value				Fair value
						In millions of won
Assets recognized at fair value
Financial assets at fair value through other comprehensive income		￦					502,829				502,829				502,443				502,443
Derivative assets (trading)							693,072				693,072				730,948				730,948
Derivative assets (hedge designated)							324,952				324,952				269,446				269,446
Financial assets at fair value through profit or loss							3,709,508				3,709,508				2,711,285				2,711,285
		￦					5,230,361				5,230,361				4,214,122				4,214,122
Assets carried at amortized cost
Financial assets at amortized cost		￦					26,998				26,998				38,843				38,843
Loans and receivables							1,013,371				1,013,371				988,331				988,331
Trade and other receivables							12,614,902				12,614,902				14,179,322				14,179,322
Long-term financial instruments							686,322				686,322				833,737				833,737
Short-term financial instruments							666,758				666,758				578,578				578,578
Cash and cash equivalents							3,234,780				3,234,780				4,342,887				4,342,887
		￦					18,243,131				18,243,131				20,961,698				20,961,698
Liabilities recognized at fair value
Derivative liabilities (trading)		￦					407,246				407,246				428,670				428,670
Derivative liabilities (hedge designated)							25,505				25,505				23,564				23,564
		￦					432,751				432,751				452,234				452,234
Liabilities carried at amortized cost
Secured borrowings		￦					102,368				102,368				773,646				773,646
Unsecured bond							105,185,189				96,846,056				113,792,178				111,218,771
Lease liabilities							4,163,143				4,163,143				3,807,880				3,807,880
Unsecured borrowings							15,282,193				15,280,693				19,062,162				19,061,348
Trade and other payables(*)							13,459,320				13,459,320				10,264,050				10,264,050
Bank overdraft							35,615				35,615				3,844				3,844
		￦					138,227,828				129,887,195				147,703,760				145,129,539

(*) Excludes lease liabilities.

Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Financial Instruments

The discount rates used for calculating fair value as of December 31, 2022 and 2023 are as follows:

Type		2022				2023
Derivatives			0.60% ~ 7.93%				0.93%~10.36%
Borrowings and debt securities			0.75% ~ 5.84%				0.96%~5.84%
Finance lease			0.00% ~ 17.08%				0.00%~17.03%

Summary of Fair Value Measurement of Financial Instruments

Fair values of financial instruments by hierarchy level as of December 31, 2022 and 2023 are as follows:

						2022
Type						Level 1				Level 2				Level 3				Total
						In millions of won
Financial assets at fair value
Financial assets at fair value through other comprehensive income		￦					300,057				—				202,772				502,829
Derivative assets							—				1,018,024				—				1,018,024
Financial assets at fair value through profit or loss							—				3,703,179				6,329				3,709,508
		￦					300,057				4,721,203				209,101				5,230,361
Financial liabilities at fair value
Derivative liabilities		￦					—				432,751				—				432,751
						2023
Type						Level 1				Level 2				Level 3				Total
							In millions of won
Financial assets at fair value
Financial assets at fair value through other comprehensive income		￦					285,054				—				217,389				502,443
Derivative assets							—				1,000,394				—				1,000,394
Financial assets at fair value through profit or loss							—				2,704,550				6,735				2,711,285
		￦					285,054				3,704,944				224,124				4,214,122
Financial liabilities at fair value
Derivative liabilities		￦					—				452,234				—				452,234

Summary of Reconciliation of Changes in Fair Value Measurement, Assets

Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2022 and 2023 are as follows:

						2022
						Beginning balance				Acquisitions				Reclassified category				Valuation				Disposal				Foreign currency translation and others				Ending balance
						In millions of won
Financial assets at fair value
Financial assets at fair value through profit or loss Cooperative		￦					5,797				400				—				132				—				—				6,329
Financial assets at fair value through other comprehensive income
Unlisted securities							160,790				9,451				—				33,237				—				(1,235	)			202,243
Debt securities							491				—				—				38				—				—				529
						2023
						Beginning balance				Acquisitions				Reclassified category				Valuation				Disposal				Foreign currency translation and others				Ending balance
						In millions of won
Financial assets at fair value
Financial assets at fair value through profit or loss Cooperative		￦					6,329				—				270				136				—				—				6,735
Financial assets at fair value through other comprehensive income
Unlisted securities							202,243				9,550				—				5,445				(5,332)				856				212,762
Debt securities							529				4,080				—				18				—				—				4,627

X

- Definition

The disclosure of an analysis of the present value of a defined benefit obligation that distinguishes the nature, characteristics and risks of the obligation. Such a disclosure could distinguish: (a) between amounts owing to active members, deferred members, and pensioners; (b) between vested benefits and accrued but not vested benefits; and (c) between conditional benefits, amounts attributable to future salary increases and other benefits. [Refer: Defined benefit obligation, at present value]

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The disclosure of the fair value of financial instruments. [Refer: Financial instruments, class [member]; At fair value [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The disclosure of a maturity analysis for derivative financial liabilities, including the remaining contractual maturities for those derivative financial liabilities for which contractual maturities are essential for an understanding of the timing of the cash flows. [Refer: Derivative financial liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The disclosure of a maturity analysis for non-derivative financial liabilities (including issued financial guarantee contracts) that shows the remaining contractual maturities. [Refer: Derivative financial liabilities]

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Disclosure of significant unobservable inputs used in fair value measurement of financial instruments explanatory.

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Foreign Currency Disclosure

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