Amount of short-term and long-term debt and lease obligation.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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 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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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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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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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	12 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 4,900	$ 25,000		$ 25,000	$ 4,900
Proceeds from Debt, Net of Issuance Costs	4,870	24,802
Interest Costs Incurred					2,280	$ 867	$ 624
Interest Paid, Including Capitalized Interest, Operating and Investing Activities					1,925	973	$ 616
Available amount under credit facility			$ 13,825
Total debt	63,583				63,583	$ 27,302
Line of Credit Facility, Maximum Borrowing Capacity			$ 13,825
Customer Financing [Member]
Debt Instrument [Line Items]
Customer Financing Asset Used For Collateralizing Debt	167				167
Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	15				15
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility	9,473				9,473
Line of Credit Facility, Maximum Borrowing Capacity	9,473				9,473
Revolving Credit Facility [Member] \| 364-day Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility	3,073				3,073
Line of Credit Facility, Maximum Borrowing Capacity	3,073				3,073
Revolving Credit Facility [Member] \| Three Year Credit Facility
Debt Instrument [Line Items]
Available amount under credit facility	3,200				3,200
Line of Credit Facility, Maximum Borrowing Capacity	3,200				3,200
Revolving Credit Facility [Member] \| Five Year Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility	3,200				3,200
Line of Credit Facility, Maximum Borrowing Capacity	3,200				3,200
Delayed Draw Term Loan Facility [Member]
Debt Instrument [Line Items]
Debt maturity date			Feb. 06, 2022
Proceeds from Long-term Lines of Credit			$ 13,825
Debt Instrument, Maturity Date			Feb. 06, 2022
Delayed Draw Term Loan Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.75%
Delayed Draw Term Loan Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.25%
Five Point Zero Four Percent due May 1, 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 2,000		$ 2,000
Debt maturity date		May 01, 2027
Debt Instrument, Interest Rate, Stated Percentage		5.04%		5.04%
Debt Instrument, Maturity Date		May 01, 2027
Four Point Five Zero Eight Percent due May 1, 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,000		$ 3,000
Debt maturity date		May 01, 2023
Debt Instrument, Interest Rate, Stated Percentage		4.508%		4.508%
Debt Instrument, Maturity Date		May 01, 2023
Four Point Eight Seven Five Percent due May 1, 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,500		$ 3,500
Debt maturity date				May 01, 2025
Debt Instrument, Interest Rate, Stated Percentage		4.875%		4.875%
Debt Instrument, Maturity Date				May 01, 2025
Five Point One Five Percent due May 1, 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 4,500		$ 4,500
Debt maturity date		May 01, 2030
Debt Instrument, Interest Rate, Stated Percentage		5.15%		5.15%
Debt Instrument, Maturity Date		May 01, 2030
Five Point Seven Zero Five Percent due May 1, 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,000		$ 3,000
Debt maturity date		May 01, 2040
Debt Instrument, Interest Rate, Stated Percentage		5.705%		5.705%
Debt Instrument, Maturity Date		May 01, 2040
Five Point Eight Zero Five Percent due May 1, 2050 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 5,500		$ 5,500
Debt maturity date		May 01, 2050
Debt Instrument, Interest Rate, Stated Percentage		5.805%		5.805%
Debt Instrument, Maturity Date		May 01, 2050
Five Point Nine Three Percent due May 1, 2060 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,500		$ 3,500
Debt maturity date		May 01, 2060
Debt Instrument, Interest Rate, Stated Percentage		5.93%		5.93%
Debt Instrument, Maturity Date		May 01, 2060
Two Point Seven Five Percent due on February 1, 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,400				$ 1,400
Debt maturity date	Feb. 01, 2026
Debt Instrument, Interest Rate, Stated Percentage	2.75%				2.75%
Debt Instrument, Maturity Date	Feb. 01, 2026
Three Point Two Five Percent due February 1, 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,100				$ 1,100
Debt maturity date	Feb. 01, 2028
Debt Instrument, Interest Rate, Stated Percentage	3.25%				3.25%
Debt Instrument, Maturity Date	Feb. 01, 2028
One Point Nine Five Percent due on February 1, 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,000				$ 1,000
Debt maturity date	Feb. 01, 2024
Debt Instrument, Interest Rate, Stated Percentage	1.95%				1.95%
Debt Instrument, Maturity Date	Feb. 01, 2024
Three Point Six Two Five Percent due February 1, 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,400				$ 1,400
Debt maturity date	Feb. 01, 2031
Debt Instrument, Interest Rate, Stated Percentage	3.625%				3.625%
Debt Instrument, Maturity Date	Feb. 01, 2031