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Senior Notes (Narrative) (Details) - Senior Notes [Member] | 12 Months Ended
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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

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