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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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	May 18, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 18, 2016
Debt Instrument, Face Amount	$ 1,200
Proceeds from Debt, Net of Issuance Costs	1,170
Interest Costs Incurred		$ 535	$ 497	$ 504
Interest Paid		523	488	$ 511
Total debt		9,952	$ 9,964
Customer Financing [Member]
Debt Instrument [Line Items]
Customer Financing Asset Used For Collateralizing Debt		259
Secured Debt [Member]
Debt Instrument [Line Items]
Total debt		127
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility		5,000
Revolving Credit Facility [Member] \| 364-day Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility		$ 2,480
Maturity date of credit line agreements		Nov. 01, 2017
Revolving Credit Facility [Member] \| Five Year Credit Facility [Member] \| Five Year Expiration [Member]
Debt Instrument [Line Items]
Available amount under credit facility		$ 2,370
Maturity date of credit line agreements		Nov. 02, 2021
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] \| Next twelve months Expiration [Member]
Debt Instrument [Line Items]
Available amount under credit facility		$ 60
Maturity date of credit line agreements		Nov. 30, 2017
One Point Eight Seven Five Percent due on June 15, 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400
Debt maturity date	Jun. 15, 2023
Debt Instrument, Interest Rate, Stated Percentage	1.875%
Two Point Two Five Percent due on June 15, 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400
Debt maturity date	Jun. 15, 2026
Debt Instrument, Interest Rate, Stated Percentage	2.25%