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v3.20.4

Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Par Value | $ 42,563 | $ 39,817
Carrying Value, Combined Amount | 42,280 | 39,474
Fair Value | 51,301 | 44,234
Commercial Paper [Member] |  |
Debt Instrument [Line Items] |  |
Par Value | 1,296 | 400
Commercial Paper | 1,296 | 400
Fair Value | $ 1,296 | 400
2.700% notes Due July 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.70% |
Par Value | $ 0 | 1,500
Carrying Value, Current | 0 | 1,499
Fair Value | 0 | 1,506
Floating rate notes due October 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Par Value | 0 | 300
Carrying Value, Current | 0 | 300
Fair Value | $ 0 | 300
3.875% notes Due October 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.875% |
Par Value | $ 0 | 450
Carrying Value, Current | 0 | 450
Fair Value | $ 0 | 455
1.950% notes due October 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.95% |
Par Value | $ 0 | 900
Carrying Value, Current | 0 | 899
Fair Value | $ 0 | 900
4.700% Notes Due February 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |
Par Value | $ 400 | 400
Carrying Value, Noncurrent |  | 403
Carrying Value, Current | 400 |
Fair Value | $ 401 | 410
2.125% notes due March 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.125% |
Par Value | $ 750 | 750
Carrying Value, Noncurrent |  | 749
Carrying Value, Current | 750 |
Fair Value | 753 | 753
Floating rate notes due June 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Par Value | 350 | 350
Carrying Value, Noncurrent |  | 349
Carrying Value, Current | 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, Noncurrent |  | 399
Carrying Value, Current | 400 |
Fair Value | $ 405 | 407
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, Noncurrent |  | 501
Carrying Value, Current | 507 |
Fair Value | $ 509 | 512
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, Noncurrent |  | 753
Carrying Value, Current | 762 |
Fair Value | $ 768 | 765
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, Noncurrent | 1,113 | 1,087
Fair Value | $ 1,127 | 1,121
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 | 998
Fair Value | $ 1,048 | 1,036
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 | 897 | 896
Fair Value | $ 935 | 911
0.000% 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 | 13
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 | 644 | 624
Fair Value | $ 654 | 638
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 | 789 | 770
Fair Value | $ 793 | 770
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 | 747
Fair Value | $ 809 | 786
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 | 746
Fair Value | $ 821 | 792
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 | 747 | 747
Fair Value | $ 799 | 760
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 | 1,990
Fair Value | $ 2,279 | 2,161
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 | $ 344 | 325
1.250% notes due January 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.25% |
Par Value | $ 500 | 0
Carrying Value, Noncurrent | 496 | 0
Fair Value | $ 515 | 0
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 | 996
Fair Value | $ 1,121 | 1,048
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 | 746
Fair Value | $ 859 | 804
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 | $ 714 | 667
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 | 940 | 939
Fair Value | $ 1,067 | 988
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 | 1,143 | 1,142
Fair Value | $ 1,367 | 1,269
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 | 843
Fair Value | $ 1,019 | 941
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 | 1,086 | 993
Fair Value | $ 1,137 | 1,029
2.000% notes due May 2030 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.00% |
Par Value | $ 1,250 | 0
Carrying Value, Noncurrent | 1,234 | 0
Fair Value | $ 1,326 | 0
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 | $ 1,340 | 1,215
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 | 838
Fair Value | $ 1,271 | 1,129
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 | $ 800 | 712
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 | 641 | 641
Fair Value | $ 1,044 | 940
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 | 1,076
Fair Value | $ 1,802 | 1,631
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 | 1,241 | 1,241
Fair Value | $ 1,487 | 1,313
2.750% notes due May 2040 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |
Par Value | $ 1,000 | 0
Carrying Value, Noncurrent | 964 | 0
Fair Value | $ 1,085 | 0
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 | $ 451 | 396
5.950% notes Due Februrary 2041 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.95% |
Par Value | $ 350 | 350
Carrying Value, Noncurrent | 346 | 345
Fair Value | $ 540 | 475
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 | $ 820 | 716
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 | 484
Fair Value | $ 661 | 580
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 | 607
Fair Value | $ 790 | 688
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 | $ 982 | 856
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 | 1,973
Fair Value | $ 2,814 | 2,463
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 | $ 991 | 861
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 | 717 | 717
Fair Value | $ 963 | 839
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 | $ 1,180 | 1,023
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 | $ 1,803 | 1,569
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 | 1,086 | 1,086
Fair Value | $ 1,517 | 1,316
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 | $ 1,567 | 1,344
2.900% notes due May 2050 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.90% |
Par Value | $ 1,250 | 0
Carrying Value, Noncurrent | 1,208 | 0
Fair Value | $ 1,384 | 0
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 | $ 1,618 | 1,350
3.125% notes due May 2060 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.125% |
Par Value | $ 1,000 | 0
Carrying Value, Noncurrent | 965 | 0
Fair Value | $ 1,161 | $ 0

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