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Amount of assets pledged to secure a debt instrument.

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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	Dec. 31, 2018	Oct. 31, 2018	Feb. 23, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, Issuance Date		Oct. 31, 2018	Feb. 23, 2018
Debt Instrument, Face Amount		$ 700	$ 1,400
Proceeds from Debt, Net of Issuance Costs		663	1,338
Interest Costs Incurred				$ 624	$ 541	$ 535
Interest Paid, Including Capitalized Interest, Operating and Investing Activities				616	527	$ 523
Total debt	$ 13,847			13,847	$ 11,117
Customer Financing [Member]
Debt Instrument [Line Items]
Customer Financing Asset Used For Collateralizing Debt	204			204
Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	62			62
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility	$ 5,120			5,120
Revolving Credit Facility [Member] \| 364-day Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt maturity date	Oct. 31, 2019
Available amount under credit facility	$ 2,610			2,610
Revolving Credit Facility [Member] \| Five Year Credit Facility [Member] \| Five Year Expiration [Member]
Debt Instrument [Line Items]
Debt maturity date	Oct. 31, 2023
Available amount under credit facility	$ 2,510			$ 2,510
Two Point Eight Percent due on March 1, 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 350
Debt maturity date			Mar. 01, 2023
Debt Instrument, Interest Rate, Stated Percentage			2.80%
Three Point Two Five Percent due on March 1, 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 350
Debt maturity date			Mar. 01, 2028
Debt Instrument, Interest Rate, Stated Percentage			3.25%
Three Point Five Five Percent due on March 1, 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 350
Debt maturity date			Mar. 01, 2038
Debt Instrument, Interest Rate, Stated Percentage			3.55%
Three Point Six Two Five Percent due on March 1, 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 350
Debt maturity date			Mar. 01, 2048
Debt Instrument, Interest Rate, Stated Percentage			3.625%
Three Point Four Five Percent due on November 1, 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 350
Debt maturity date		Nov. 01, 2028
Debt Instrument, Interest Rate, Stated Percentage		3.45%
Three Point Eight Five Percent due on November 1, 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 350
Debt maturity date		Nov. 01, 2048
Debt Instrument, Interest Rate, Stated Percentage		3.85%