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Loans Payable, Long-Term Debt and Leases - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-Term Debt	$ 25,360	$ 22,736
2.75% notes due 2025
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.75%
Long-Term Debt	$ 2,493	2,492
3.70% notes due 2045
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.70%
Long-Term Debt	$ 1,976	1,975
2.80% notes due 2023
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.80%
Long-Term Debt	$ 1,748	1,747
3.40% notes due 2029
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.40%
Long-Term Debt	$ 1,734	1,732
4.00% notes due 2049
Debt Instrument [Line Items]
Stated interest rate (as percent)	4.00%
Long-Term Debt	$ 1,469	1,468
2.35% notes due 2040
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.35%
Long-Term Debt	$ 982	0
4.15% notes due 2043
Debt Instrument [Line Items]
Stated interest rate (as percent)	4.15%
Long-Term Debt	$ 1,238	1,238
1.45% notes due 2030
Debt Instrument [Line Items]
Stated interest rate (as percent)	1.45%
Long-Term Debt	$ 1,233	0
1.875% euro-denominated notes due 2026
Debt Instrument [Line Items]
Stated interest rate (as percent)	1.875%
Long-Term Debt	$ 1,218	1,107
2.45% notes due 2050
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.45%
Long-Term Debt	$ 1,211	0
2.40% notes due 2022
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.40%
Long-Term Debt	$ 1,032	1,010
0.75% notes due 2026
Debt Instrument [Line Items]
Stated interest rate (as percent)	0.75%
Long-Term Debt	$ 991	0
3.90% notes due 2039
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.90%
Long-Term Debt	$ 983	982
2.35% notes due 2022
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.35%
Long-Term Debt	$ 1,269	1,248
2.90% notes due 2024
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.90%
Long-Term Debt	$ 746	745
6.50% notes due 2033
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.50%
Long-Term Debt	$ 719	722
0.50% euro-denominated notes due 2024
Debt Instrument [Line Items]
Stated interest rate (as percent)	0.50%
Long-Term Debt	$ 611	555
1.375% euro-denominated notes due 2036
Debt Instrument [Line Items]
Stated interest rate (as percent)	1.375%
Long-Term Debt	$ 606	551
2.50% euro-denominated notes due 2034
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.50%
Long-Term Debt	$ 605	550
3.60% notes due 2042
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.60%
Long-Term Debt	$ 491	490
6.55% notes due 2037
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.55%
Long-Term Debt	$ 411	412
5.75% notes due 2036
Debt Instrument [Line Items]
Stated interest rate (as percent)	5.75%
Long-Term Debt	$ 338	338
5.95% debentures due 2028
Debt Instrument [Line Items]
Stated interest rate (as percent)	5.95%
Long-Term Debt	$ 306	306
5.85% notes due 2039
Debt Instrument [Line Items]
Stated interest rate (as percent)	5.85%
Long-Term Debt	$ 271	271
6.40% debentures due 2028
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.40%
Long-Term Debt	$ 250	250
6.30% debentures due 2026
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.30%
Long-Term Debt	$ 135	135
3.875% notes due 2021
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.875%
Long-Term Debt	$ 0	1,151
1.125% euro-denominated notes due 2021
Debt Instrument [Line Items]
Stated interest rate (as percent)	1.125%
Long-Term Debt	$ 0	1,113
Other
Debt Instrument [Line Items]
Long-Term Debt	$ 294	$ 148

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