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Debt Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Debt Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Oct. 25, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 9,800	$ 9,825	$ 9,800
Proceeds from Debt, Net of Issuance Costs		9,780
Repayments of Debt	1,200		11,049	$ 8,792
Debt, Current	5,377		5,377			$ 1,693
One Point One Six Seven Percent due February 4, 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,325
Debt Instrument, Maturity Date		Feb. 04, 2023
Debt Instrument, Interest Rate, Stated Percentage		1.167%
One Point Four Three Three Percent due February 4, 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 3,000
Debt Instrument, Maturity Date		Feb. 04, 2024
Debt Instrument, Interest Rate, Stated Percentage		1.433%
Two Point One Nine Six Percent due February 4, 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 5,500
Debt Instrument, Maturity Date		Feb. 04, 2026
Debt Instrument, Interest Rate, Stated Percentage		2.196%
Delayed Draw Term Loan Facility
Debt Instrument [Line Items]
Repayments of Debt	9,800	$ 9,825
Debt, Current	4,000		4,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	14,753		14,753
Three Hundred And Sixty Four Day Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,073		3,073
Three Hundred And Sixty Four Day Revolving Credit Facility \| Subsequent Event [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 3,060
Two Year Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	5,280		5,280
Three Year Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,200		3,200
Five Year Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,200		$ 3,200