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

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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 YYYY-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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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 9,800	$ 9,825	$ 9,800
Proceeds from Debt, Net of Issuance Costs			9,780
Interest Costs Incurred			2,790	$ 2,280	$ 867
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			2,583	1,925	973
Total debt	58,102		58,102	63,583
Debt repayments			15,371	$ 10,998	$ 12,171
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility	14,740		14,740
Line of Credit Facility, Maximum Borrowing Capacity	14,740		14,740
364-day Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility	3,060		3,060
Line of Credit Facility, Maximum Borrowing Capacity	3,060		3,060
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
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 repayments	4,000	9,825	13,800
Two Year Credit Facility [Member]
Debt Instrument [Line Items]
Available amount under credit facility	5,280		5,280
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,280		$ 5,280
One Point One Six Seven Percent due February 4, 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,325
Debt maturity date		Feb. 04, 2023
Debt Instrument, Interest Rate, Stated Percentage		1.167%
Debt Instrument, Maturity Date		Feb. 04, 2023
One Point Four Three Three Percent due February 4, 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,000
Debt maturity date		Feb. 04, 2024
Debt Instrument, Interest Rate, Stated Percentage		1.433%
Debt Instrument, Maturity Date		Feb. 04, 2024
Two Point One Nine Six Percent due February 4, 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 5,500
Debt maturity date		Feb. 04, 2026
Debt Instrument, Interest Rate, Stated Percentage		2.196%
Debt Instrument, Maturity Date		Feb. 04, 2026