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Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Par Value	$ 45,473	$ 42,563
Carrying value, Combined Amount	45,108	42,280
Fair Value	50,462	51,301
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper	5,355	1,296
Par Value	5,356	1,296
Fair Value	$ 5,355	1,296
4.700% notes due February 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Par Value	$ 0	400
Carrying Value, Current	0	400
Fair Value	$ 0	401
2.125% notes due March 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.125%
Par Value	$ 0	750
Carrying Value, Current	0	750
Fair Value	0	753
Floating rate notes due June 2021 [Member]
Debt Instrument [Line Items]
Par Value	350	350
Carrying Value, Current	350	350
Fair Value	$ 350	350
3.150% notes due June 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.15%
Par Value	$ 400	400
Carrying Value, Current	400	400
Fair Value	$ 402	405
3.375% notes due November 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Par Value	$ 500	500
Carrying Value, Current	505	507
Fair Value	$ 506	509
2.875% notes due December 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 750	750
Carrying Value, Current	759	762
Fair Value	$ 764	768
2.875% notes due March 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 1,100	1,100
Carrying Value, Current	1,110
Carrying Value, Noncurrent		1,113
Fair Value	$ 1,120	1,127
3.350% notes due July 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.35%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	999	999
Fair Value	$ 1,038	1,048
2.375% notes due October 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.375%
Par Value	$ 900	900
Carrying Value, Noncurrent	898	897
Fair Value	$ 929	935
Zero Coupon notes due November 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Par Value	$ 15	15
Carrying Value, Noncurrent	14	14
Fair Value	$ 14	14
2.750% notes due February 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Par Value	$ 625	625
Carrying Value, Noncurrent	641	644
Fair Value	$ 648	654
2.875% notes due March 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 750	750
Carrying Value, Noncurrent	784	789
Fair Value	$ 786	793
3.500% notes due June 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 750	750
Carrying Value, Noncurrent	748	748
Fair Value	$ 801	809
3.500% notes due February 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 750	750
Carrying Value, Noncurrent	747	747
Fair Value	$ 813	821
2.375% notes due August 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.375%
Par Value	$ 750	750
Carrying Value, Noncurrent	748	747
Fair Value	$ 790	799
3.750% notes due July 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Par Value	$ 2,000	2,000
Carrying Value, Noncurrent	1,992	1,992
Fair Value	$ 2,214	2,279
3.700% notes due December 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Par Value	$ 300	300
Carrying Value, Noncurrent	298	298
Fair Value	$ 333	344
1.250% notes due January 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.25%
Par Value	$ 500	500
Carrying Value, Noncurrent	496	496
Fair Value	$ 500	515
3.100% notes due March 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.10%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	997	997
Fair Value	$ 1,086	1,121
3.450% notes due January 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.45%
Par Value	$ 750	750
Carrying Value, Noncurrent	747	747
Fair Value	$ 831	859
3.375% notes due April 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Par Value	$ 625	625
Carrying Value, Noncurrent	620	620
Fair Value	$ 686	714
2.950% notes due October 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.95%
Par Value	$ 950	950
Carrying Value, Noncurrent	941	940
Fair Value	$ 1,024	1,067
3.850% notes due June 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.85%
Par Value	$ 1,150	1,150
Carrying Value, Noncurrent	1,144	1,143
Fair Value	$ 1,290	1,367
3.875% notes due December 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Par Value	$ 850	850
Carrying Value, Noncurrent	844	844
Fair Value	$ 958	1,019
2.875% notes due August 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	1,015	1,086
Fair Value	$ 1,057	1,137
2.000% notes due May 2030
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,234	1,234
Fair Value	$ 1,226	1,326
4.625% notes due July 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	992	992
Fair Value	$ 1,216	1,340
5.800% notes due March 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.80%
Par Value	$ 850	850
Carrying Value, Noncurrent	839	839
Fair Value	$ 1,147	1,271
6.500% Notes Due June 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Par Value	$ 500	500
Carrying Value, Noncurrent	492	492
Fair Value	$ 725	800
6.625% Notes due November 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Par Value	$ 650	650
Carrying Value, Noncurrent	642	641
Fair Value	$ 959	1,044
6.875% notes due February 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%
Par Value	$ 1,100	1,100
Carrying Value, Noncurrent	1,077	1,077
Fair Value	$ 1,648	1,802
3.500% notes due August 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,242	1,241
Fair Value	$ 1,342	1,487
2.750% notes due May 2040
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	964	964
Fair Value	$ 976	1,085
5.700% notes due October 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.70%
Par Value	$ 300	300
Carrying Value, Noncurrent	296	296
Fair Value	$ 412	451
5.950% notes due February 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.95%
Par Value	$ 350	350
Carrying Value, Noncurrent	346	346
Fair Value	$ 494	540
4.625% notes due November 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Par Value	$ 600	600
Carrying Value, Noncurrent	589	589
Fair Value	$ 736	820
4.375% notes due March 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.375%
Par Value	$ 502	502
Carrying Value, Noncurrent	485	485
Fair Value	$ 593	661
3.950% notes due October 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Par Value	$ 625	625
Carrying Value, Noncurrent	608	608
Fair Value	$ 712	790
4.250% notes due March 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 750	750
Carrying Value, Noncurrent	735	735
Fair Value	$ 878	982
4.750% notes due July 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Par Value	$ 2,000	2,000
Carrying Value, Noncurrent	1,974	1,974
Fair Value	$ 2,496	2,814
4.200% notes due January 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.20%
Par Value	$ 750	750
Carrying Value, Noncurrent	738	738
Fair Value	$ 875	991
4.250% notes due April 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 725	725
Carrying Value, Noncurrent	718	717
Fair Value	$ 847	963
3.750% notes due October 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Par Value	$ 950	950
Carrying Value, Noncurrent	934	934
Fair Value	$ 1,031	1,180
4.250% notes due June 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 1,350	1,350
Carrying Value, Noncurrent	1,330	1,330
Fair Value	$ 1,592	1,803
4.450% notes due December 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.45%
Par Value	$ 1,100	1,100
Carrying Value, Noncurrent	1,087	1,086
Fair Value	$ 1,345	1,517
3.700% notes due August 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,235	1,235
Fair Value	$ 1,354	1,567
2.900% notes due May 2050
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.90%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,208	1,208
Fair Value	$ 1,193	1,384
3.875% notes due August 2059 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,228	1,228
Fair Value	$ 1,391	1,618
3.125% notes due May 2060
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.125%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	963	965
Fair Value	$ 979	$ 1,161

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