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Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying Value	$ 44,632	$ 42,280
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper	$ 0	1,296
4.700% Notes Due February 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Par Value	$ 400
Unsecured Debt, Current	$ 0	400
2.125% notes due March 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.125%
Par Value	$ 750
Unsecured Debt, Current	0	750
Floating rate notes due June 2021 [Member]
Debt Instrument [Line Items]
Par Value	350
Unsecured Debt, Current	$ 0	350
3.150% notes due June 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.15%
Par Value	$ 400
Unsecured Debt, Current	$ 0	400
3.375% Notes Due November 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Par Value	$ 500
Unsecured Debt, Current	$ 0	507
2.875% Notes Due December 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 750
Unsecured Debt, Current	$ 0	762
2.875% Notes Due March 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 1,100
Unsecured Long-term Debt, Noncurrent		1,113
Unsecured Debt, Current	$ 1,097
3.350% Notes Due July 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.35%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent		999
Unsecured Debt, Current	$ 999
2.375% notes due October 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.375%
Par Value	$ 900
Unsecured Long-term Debt, Noncurrent		897
Unsecured Debt, Current	$ 899
0.000% Notes Due November 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Par Value	$ 15
Unsecured Long-term Debt, Noncurrent		14
Unsecured Debt, Current	$ 14
2.750% Notes Due February 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Par Value	$ 625
Unsecured Long-term Debt, Noncurrent	$ 632	644
2.875% Notes Due March 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 750
Unsecured Long-term Debt, Noncurrent	$ 768	789
3.500% notes due June 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 750
Unsecured Long-term Debt, Noncurrent	$ 749	748
3.500% notes due February 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 750
Unsecured Long-term Debt, Noncurrent	$ 748	747
0.550% notes due May 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.55%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent	$ 996	0
2.375% notes due August 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.375%
Par Value	$ 750
Unsecured Long-term Debt, Noncurrent	$ 748	747
3.750% Notes Due July 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Par Value	$ 2,000
Unsecured Long-term Debt, Noncurrent	$ 1,994	1,992
3.700% notes due December 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Par Value	$ 300
Unsecured Long-term Debt, Noncurrent	$ 299	298
1.250% notes due January 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.25%
Par Value	$ 500
Unsecured Long-term Debt, Noncurrent	$ 497	496
3.100% notes due March 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.10%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent	$ 997	997
1.150% notes due May 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.15%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent	$ 972	0
3.450% notes due January 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.45%
Par Value	$ 750
Unsecured Long-term Debt, Noncurrent	$ 747	747
3.375% notes due April 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Par Value	$ 625
Unsecured Long-term Debt, Noncurrent	$ 621	620
2.950% notes due October 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.95%
Par Value	$ 950
Unsecured Long-term Debt, Noncurrent	$ 942	940
3.850% notes due June 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.85%
Par Value	$ 1,150
Unsecured Long-term Debt, Noncurrent	$ 1,144	1,143
3.875% notes due December 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Par Value	$ 850
Unsecured Long-term Debt, Noncurrent	$ 844	844
2.875% notes due August 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent	$ 1,023	1,086
2.000% notes due May 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Par Value	$ 1,250
Unsecured Long-term Debt, Noncurrent	$ 1,235	1,234
2.300% notes due May 2031 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.30%
Par Value	$ 1,500
Unsecured Long-term Debt, Noncurrent	$ 1,482	0
4.625% notes Due July 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent	$ 993	992
5.800% notes Due March 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.80%
Par Value	$ 850
Unsecured Long-term Debt, Noncurrent	$ 839	839
6.500% notes Due June 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Par Value	$ 500
Unsecured Long-term Debt, Noncurrent	$ 492	492
6.625% notes due November 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Par Value	$ 650
Unsecured Long-term Debt, Noncurrent	$ 642	641
6.875% notes Due Februray 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%
Par Value	$ 1,100
Unsecured Long-term Debt, Noncurrent	$ 1,078	1,077
3.500% notes due August 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 1,250
Unsecured Long-term Debt, Noncurrent	$ 1,242	1,241
2.750% notes due May 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent	$ 966	964
5.700% notes Due October 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.70%
Par Value	$ 300
Unsecured Long-term Debt, Noncurrent	$ 296	296
5.950% notes Due Februrary 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.95%
Par Value	$ 350
Unsecured Long-term Debt, Noncurrent	$ 346	346
3.050% notes due May 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.05%
Par Value	$ 1,500
Unsecured Long-term Debt, Noncurrent	$ 1,483	0
4.625% notes Due November 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Par Value	$ 600
Unsecured Long-term Debt, Noncurrent	$ 589	589
4.375% notes Due March 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.375%
Par Value	$ 502
Unsecured Long-term Debt, Noncurrent	$ 485	485
3.950% notes Due October 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Par Value	$ 625
Unsecured Long-term Debt, Noncurrent	$ 608	608
4.250% notes Due March 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 750
Unsecured Long-term Debt, Noncurrent	$ 736	735
4.750% notes Due July 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Par Value	$ 2,000
Unsecured Long-term Debt, Noncurrent	$ 1,974	1,974
4.200% notes due January 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.20%
Par Value	$ 750
Unsecured Long-term Debt, Noncurrent	$ 739	738
4.250% notes due April 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 725
Unsecured Long-term Debt, Noncurrent	$ 718	717
3.750% notes due October 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Par Value	$ 950
Unsecured Long-term Debt, Noncurrent	$ 934	934
4.250% notes due June 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 1,350
Unsecured Long-term Debt, Noncurrent	$ 1,330	1,330
4.450% notes due December 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.45%
Par Value	$ 1,100
Unsecured Long-term Debt, Noncurrent	$ 1,087	1,086
3.700% notes due August 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Par Value	$ 1,250
Unsecured Long-term Debt, Noncurrent	$ 1,236	1,235
2.900% notes due May 2050 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.90%
Par Value	$ 1,250
Unsecured Long-term Debt, Noncurrent	$ 1,209	1,208
3.250% notes due May 2051 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Par Value	$ 2,000
Unsecured Long-term Debt, Noncurrent	$ 1,970	0
3.875% notes due August 2059 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Par Value	$ 1,250
Unsecured Long-term Debt, Noncurrent	$ 1,228	1,228
3.125% notes due May 2060 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.125%
Par Value	$ 1,000
Unsecured Long-term Debt, Noncurrent	$ 965	$ 965

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