Senior Notes (Narrative) (Details) - Senior Notes [Member]	12 Months Ended
Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Debt instrument face amount	$ 2,400,000,000
4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date issued	Jun. 05, 2014
Debt instrument face amount	$ 400,000,000
Debt instrument, stated interest rate	4.868%
Debt instrument, maturity date	Jun. 01, 2044
3.5% Senior Notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Date issued	Oct. 07, 2020
Debt instrument face amount	$ 1,000,000,000
Debt instrument, stated interest rate	3.50%
Debt instrument, maturity date	Oct. 15, 2050
3.125% Senior Notes due 10/15/2052 [Member]
Debt Instrument [Line Items]
Date issued	Oct. 04, 2021
Debt instrument face amount	$ 1,000,000,000.0
Debt instrument, term	31 years
Debt instrument, stated interest rate	3.125%
Debt instrument, maturity date	Oct. 15, 2052

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Date the debt instrument was issued, in YYYY-MM-DD format.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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