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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Debt and Credit Facilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Apr. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Proceeds from issuance of debt	$ 600
Other Long-term Debt	31			$ 35
Total debt	7,202			7,222
Less current maturities of debt	1,277			632
Total long-term debt	5,925			6,590
Unamortized debt issuance costs	41			39
Available borrowing capacity	1,552			1,547
Fair value of senior unsecured notes	$ 7,119			7,521
Senior Unsecured Notes 1.800% due 2019
Stated interest rate	1.80%		3.65%
Unsecured Debt	$ 499			499
Maturity Date	Jan. 15, 2019
Senior Unsecured Notes 1.30% due 2018
Stated interest rate		1.30%
Unsecured Debt	$ 0	$ 600
Maturity Date	Apr. 01, 2018
Commercial Paper
Debt instrument, maturity	397 days
Commercial Paper \| Maximum
Commercial paper	$ 1,500
Senior Unsecured Notes 2.000% due 2019
Stated interest rate	2.00%
Unsecured Debt	$ 749			748
Maturity Date	Mar. 08, 2019
Senior Unsecured Notes 4.375% Due 2020
Stated interest rate	4.375%
Unsecured Debt	$ 498			498
Maturity Date	Jan. 15, 2020
Senior Unsecured Notes 2.625% due 2021
Stated interest rate	2.625%
Unsecured Debt	$ 747			746
Maturity Date	Mar. 15, 2021
Senior Unsecured Notes 3.375% due 2024
Stated interest rate	3.375%
Unsecured Debt	$ 583			598
Maturity Date	May 15, 2024
Senior Unsecured Notes 3.375% due 2025
Stated interest rate	3.375%
Unsecured Debt	$ 745			745
Maturity Date	Nov. 01, 2025
Senior Unsecured Notes 3.50% due 2026
Stated interest rate	3.50%
Unsecured Debt	$ 989			988
Maturity Date	Mar. 15, 2026
Senior Unsecured Notes 3.650% due 2028
Stated interest rate	3.65%
Unsecured Debt	$ 595			0
Maturity Date	Mar. 07, 2028
Senior Unsecured Notes 4.10% due 2043
Stated interest rate	4.10%
Unsecured Debt	$ 391			391
Maturity Date	Apr. 01, 2043
Senior Unsecured Notes 4.375% due 2044
Stated interest rate	4.375%
Unsecured Debt	$ 395			394
Maturity Date	May 15, 2044
Senior Unsecured Notes 4.625% due 2046
Stated interest rate	4.625%
Unsecured Debt	$ 980			$ 980
Maturity Date	Mar. 15, 2046