Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of assets pledged to secure a debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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

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Date the debt instrument was issued, in CCYY-MM-DD format.

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

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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The amount of cash paid for interest during the period.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Debt (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Millions	Oct. 29, 2015	Feb. 20, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Oct. 29, 2015	Feb. 20, 2015
Debt instrument, face amount	$ 900	$ 750
Proceeds from Debt, Net of Issuance Costs	881	722
Interest Costs Incurred			$ 497	$ 504	$ 548
Interest Paid			488	511	$ 551
Total debt			9,964	$ 9,070
Customer Financing [Member]
Debt Instrument [Line Items]
Customer Financing Asset Used For Collateralizing Debt			295
Secured Debt [Member]
Debt Instrument [Line Items]
Total debt			163
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility			4,980
Revolving Credit Facility [Member] \| 364-day Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility			$ 2,465
Maturity date of credit line agreements			Nov. 30, 2016
Revolving Credit Facility [Member] \| Five Year Credit Facility [Member] \| Five Year Expiration [Member]
Debt Instrument [Line Items]
Available amount under credit facility			$ 2,365
Maturity date of credit line agreements			Nov. 30, 2020
Revolving Credit Facility [Member] \| Five Year Credit Facility [Member] \| Four Year Expiration [Member]
Debt Instrument [Line Items]
Available amount under credit facility			$ 90
Maturity date of credit line agreements			Nov. 30, 2019
Revolving Credit Facility [Member] \| Five Year Credit Facility [Member] \| Two Year Expiration [Member]
Debt Instrument [Line Items]
Available amount under credit facility			$ 60
Maturity date of credit line agreements			Nov. 30, 2017
Two Point Five Percent due on March 1, 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250
Debt maturity date		Mar. 01, 2025
Debt Instrument, Interest Rate, Stated Percentage		2.50%
Three Point Three Percent due on March 1, 2035 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250
Debt maturity date		Mar. 01, 2035
Debt Instrument, Interest Rate, Stated Percentage		3.30%
Three Point Five Percent due March 1, 2045 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250
Debt maturity date		Mar. 01, 2045
Debt Instrument, Interest Rate, Stated Percentage		3.50%
Two Point Two Percent due October 30, 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250
Debt maturity date	Oct. 30, 2022
Debt Instrument, Interest Rate, Stated Percentage	2.20%
Two Point Six Percent due October 30, 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 300
Debt maturity date	Oct. 30, 2025
Debt Instrument, Interest Rate, Stated Percentage	2.60%
One Point Six Five Percent due on October 30, 2020 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 350
Debt maturity date	Oct. 30, 2020
Debt Instrument, Interest Rate, Stated Percentage	1.65%