Debt and Credit Facilities (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Jan. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Proceeds from Issuance of Debt	$ 500
Commercial Paper		$ 0	$ 200
Total debt		7,225	6,914
Less current maturities		632	228
Long-term debt, excluding current maturities		6,593	6,686
Unamortized debt issuance costs		41	45
Available borrowing capacity		1,542	1,551
Fair value of debt		$ 7,446	6,762
Commercial Paper
Debt Instrument, Maturity		397 days
Commercial Paper \| Maximum
Commercial paper		$ 1,500
Senior Unsecured Notes 1.30% due 2018
Debt Instrument, Interest Rate, Stated Percentage		1.30%
Debt Instrument, Maturity Date		Apr. 01, 2018
Unsecured Debt		$ 599	598
Senior Unsecured Notes 1.800% due 2019
Debt Instrument, Interest Rate, Stated Percentage	1.80%	1.80%
Debt Instrument, Maturity Date		Jan. 15, 2019
Unsecured Debt		$ 499	0
Senior Unsecured Notes 2.000% due 2019
Debt Instrument, Interest Rate, Stated Percentage		2.00%
Debt Instrument, Maturity Date		Mar. 08, 2019
Unsecured Debt		$ 747	746
Senior Unsecured Notes 4.375% Due 2020
Debt Instrument, Interest Rate, Stated Percentage		4.375%
Debt Instrument, Maturity Date		Jan. 15, 2020
Unsecured Debt		$ 498	497
Senior Unsecured Notes 2.625% due 2021
Debt Instrument, Interest Rate, Stated Percentage		2.625%
Debt Instrument, Maturity Date		Mar. 15, 2021
Unsecured Debt		$ 746	745
Senior Unsecured Notes 3.375% due 2024
Debt Instrument, Interest Rate, Stated Percentage		3.375%
Debt Instrument, Maturity Date		May 15, 2024
Unsecured Debt		$ 603	602
Senior Unsecured Notes 3.375% due 2025
Debt Instrument, Interest Rate, Stated Percentage		3.375%
Debt Instrument, Maturity Date		Nov. 01, 2025
Unsecured Debt		$ 745	744
Senior Unsecured Notes 3.50% due 2026
Debt Instrument, Interest Rate, Stated Percentage		3.50%
Debt Instrument, Maturity Date		Mar. 15, 2026
Unsecured Debt		$ 988	987
Senior Unsecured Notes 4.10% due 2043
Debt Instrument, Interest Rate, Stated Percentage		4.10%
Debt Instrument, Maturity Date		Apr. 01, 2043
Unsecured Debt		$ 391	391
Senior Unsecured Notes 4.375% due 2044
Debt Instrument, Interest Rate, Stated Percentage		4.375%
Debt Instrument, Maturity Date		May 15, 2044
Unsecured Debt		$ 394	395
Senior Unsecured Notes 4.625% due 2046
Debt Instrument, Interest Rate, Stated Percentage		4.625%
Debt Instrument, Maturity Date		Mar. 15, 2046
Unsecured Debt		$ 980	979
Other Debt
Unsecured Debt		$ 35	$ 30

Debt Instrument, Maturity

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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

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No definition available.

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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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