Long-Term Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 28,044	$ 29,471
Less current portion of long-term debt	1,105	1,500
Long-term debt excluding current portion	26,939	27,971
Notes 2.350% To 10.20%, interest payable semi-annually, due through 2059 [Member] \| Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 23,185	$ 24,258
Notes 2.350% To 10.20%, interest payable semi-annually, due through 2059 [Member] \| Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest Rate	2.35%
Notes 2.350% To 10.20%, interest payable semi-annually, due through 2059 [Member] \| Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest Rate	10.20%
Notes 2.350% To 10.20%, interest payable semi-annually, due through 2059 [Member] \| Notes [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.40%	4.60%
USD Debenture, 7.750%, Maturing January 2027 [Member] \| Debenture [Member]
Debt Instrument [Line Items]
Long-term debt	$ 42	$ 42
Interest Rate	7.75%
Euro notes, 1.000% to 3.125%, interest payable annually, due through 2031 [Member] \| Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Long-term debt	$ 4,817	$ 5,171
Euro notes, 1.000% to 3.125%, interest payable annually, due through 2031 [Member] \| Notes Payable, Other Payables [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest Rate	1.00%
Euro notes, 1.000% to 3.125%, interest payable annually, due through 2031 [Member] \| Notes Payable, Other Payables [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest Rate	3.125%
Euro notes, 1.000% to 3.125%, interest payable annually, due through 2031 [Member] \| Notes Payable, Other Payables [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.00%	2.00%

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

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