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Borrowings and Lines of Credit (Schedule of Long-term Debt Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Other debt (including capitalized leases) $ 292 $ 315
Principal Long-Term Debt 31,470 41,274
Other (fair market value adjustments, discounts and debt issuance costs) 106 (315)
Long-term Debt 31,576 40,959
Long-term debt currently due 550 3,258
Long-term debt $ 31,026 37,701
Notes 4.875% Due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2020  
Debt Instrument, Interest Rate, Stated Percentage 4.875%  
Debt Instrument, Carrying Amount $ 0 171
Notes 4.500% Due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2020  
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
Debt Instrument, Carrying Amount $ 0 1,250
Notes 1.900% Due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2020  
Debt Instrument, Interest Rate, Stated Percentage 1.90%  
Debt Instrument, Carrying Amount $ 0 1,000
EURIBOR plus 0.20% floating rate notes due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2020  
Debt Instrument, Interest Rate, Stated Percentage 0.20%  
Debt Instrument, Carrying Amount $ 0 831
Notes 8.750% Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2021  
Debt Instrument, Interest Rate, Stated Percentage 8.75%  
Debt Instrument, Carrying Amount $ 250 250
Notes 3.100% Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2021  
Debt Instrument, Interest Rate, Stated Percentage 3.10%  
Debt Instrument, Carrying Amount $ 250 250
Notes 3.350% due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2021  
Debt Instrument, Interest Rate, Stated Percentage 3.35%  
Debt Instrument, Carrying Amount $ 0 1,000
LIBOR plus 0.650% floating rate notes due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2021  
Debt Instrument, Interest Rate, Stated Percentage 0.65%  
Debt Instrument, Carrying Amount $ 0 750
Notes 1.950% Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2021  
Debt Instrument, Interest Rate, Stated Percentage 1.95%  
Debt Instrument, Carrying Amount $ 0 750
Notes 1.125% Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2021  
Debt Instrument, Interest Rate, Stated Percentage 1.125%  
Debt Instrument, Carrying Amount $ 0 1,053
Notes 2.300% Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2022  
Debt Instrument, Interest Rate, Stated Percentage 2.30%  
Debt Instrument, Carrying Amount $ 0 500
Notes 2.800% Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2022  
Debt Instrument, Interest Rate, Stated Percentage 2.80%  
Debt Instrument, Carrying Amount $ 1,100 1,100
Notes 3.100% Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2022  
Debt Instrument, Interest Rate, Stated Percentage 3.10%  
Debt Instrument, Carrying Amount $ 0 2,300
Notes 1.250% due 2023 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2023  
Debt Instrument, Interest Rate, Stated Percentage 1.25%  
Debt Instrument, Carrying Amount $ 0 831
Notes 3.650% Due 2023 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2023  
Debt Instrument, Interest Rate, Stated Percentage 3.65%  
Debt Instrument, Carrying Amount $ 171 2,250
Notes 3.700% Due 2023 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2023  
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
Debt Instrument, Carrying Amount $ 400 400
Notes 2.800% Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2024  
Debt Instrument, Interest Rate, Stated Percentage 2.80%  
Debt Instrument, Carrying Amount $ 0 800
Notes 3.200% Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2024  
Debt Instrument, Interest Rate, Stated Percentage 3.20%  
Debt Instrument, Carrying Amount $ 950 950
Notes 1.150% Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2024  
Debt Instrument, Interest Rate, Stated Percentage 1.15%  
Debt Instrument, Carrying Amount $ 0 831
Notes 3.950% Due 2025 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2025  
Debt Instrument, Interest Rate, Stated Percentage 3.95%  
Debt Instrument, Carrying Amount $ 1,500 1,500
Notes 1.875% Due 2026 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2026  
Debt Instrument, Interest Rate, Stated Percentage 1.875%  
Debt Instrument, Carrying Amount $ 0 $ 554
Notes 2.650% Due 2026 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2026 2026
Debt Instrument, Interest Rate, Stated Percentage 2.65%  
Debt Instrument, Carrying Amount $ 719 $ 1,150
Notes 3.125% Due 2027 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2027  
Debt Instrument, Interest Rate, Stated Percentage 3.125%  
Debt Instrument, Carrying Amount $ 1,100 1,100
Notes 3.500% Due 2027 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2027  
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
Debt Instrument, Carrying Amount $ 1,300 1,300
Notes 7.100% Due 2027 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2027  
Debt Instrument, Interest Rate, Stated Percentage 7.10%  
Debt Instrument, Carrying Amount $ 141 141
Notes 6.700% Due 2028 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2028  
Debt Instrument, Interest Rate, Stated Percentage 6.70%  
Debt Instrument, Carrying Amount $ 400 400
Notes 4.125% Due 2028 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2028  
Debt Instrument, Interest Rate, Stated Percentage 4.125%  
Debt Instrument, Carrying Amount $ 3,000 3,000
Notes 7.500% Due 2029 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2029  
Debt Instrument, Interest Rate, Stated Percentage 7.50%  
Debt Instrument, Carrying Amount $ 550 550
Notes 2.150% Due 2030 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2030  
Debt Instrument, Interest Rate, Stated Percentage 2.15%  
Debt Instrument, Carrying Amount $ 612 554
Notes 5.400% Due 2035 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2035  
Debt Instrument, Interest Rate, Stated Percentage 5.40%  
Debt Instrument, Carrying Amount $ 600 600
Notes 6.050% Due 2036 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2036  
Debt Instrument, Interest Rate, Stated Percentage 6.05%  
Debt Instrument, Carrying Amount $ 600 600
Notes 6.800% Due 2036 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2036  
Debt Instrument, Interest Rate, Stated Percentage 6.80%  
Debt Instrument, Carrying Amount $ 134 134
Notes 7.000% Due 2038 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2038  
Debt Instrument, Interest Rate, Stated Percentage 7.00%  
Debt Instrument, Carrying Amount $ 159 159
Notes 6.125% Due 2038 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2038  
Debt Instrument, Interest Rate, Stated Percentage 6.125%  
Debt Instrument, Carrying Amount $ 1,000 1,000
Notes 4.450% Due 2038 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2038  
Debt Instrument, Interest Rate, Stated Percentage 4.45%  
Debt Instrument, Carrying Amount $ 750 750
Notes 5.700% Due 2040 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2040  
Debt Instrument, Interest Rate, Stated Percentage 5.70%  
Debt Instrument, Carrying Amount $ 1,000 1,000
Notes 4.500% Due 2042 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2042  
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
Debt Instrument, Carrying Amount $ 3,500 3,500
Notes 4.800% Due 2043 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2043  
Debt Instrument, Interest Rate, Stated Percentage 4.80%  
Debt Instrument, Carrying Amount $ 400 400
Notes 4.150% Due 2045 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2045  
Debt Instrument, Interest Rate, Stated Percentage 4.15%  
Debt Instrument, Carrying Amount $ 850 850
Notes 3.750% Due 2046 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2046  
Debt Instrument, Interest Rate, Stated Percentage 3.75%  
Debt Instrument, Carrying Amount $ 1,100 1,100
Notes 4.050% Due 2047 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2047  
Debt Instrument, Interest Rate, Stated Percentage 4.05%  
Debt Instrument, Carrying Amount $ 600 600
Notes 4.350% Due 2047 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2047  
Debt Instrument, Interest Rate, Stated Percentage 4.35%  
Debt Instrument, Carrying Amount $ 1,000 1,000
Notes 4.625% Due 2048 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2048  
Debt Instrument, Interest Rate, Stated Percentage 4.625%  
Debt Instrument, Carrying Amount $ 1,750 1,750
Notes 2.500% Due 2022    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2022  
Debt Instrument, Interest Rate, Stated Percentage 2.50%  
Debt Instrument, Carrying Amount $ 1,100 0
Notes 3.150% Due 2024    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2024  
Debt Instrument, Interest Rate, Stated Percentage 3.15%  
Debt Instrument, Carrying Amount $ 300 0
Notes 7.200% Due 2027    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2027  
Debt Instrument, Interest Rate, Stated Percentage 7.20%  
Debt Instrument, Carrying Amount $ 382 0
Notes 7.000% Due 2028    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2028  
Debt Instrument, Interest Rate, Stated Percentage 7.00%  
Debt Instrument, Carrying Amount $ 185 0
Notes 2.250% Due 2030 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2030  
Debt Instrument, Interest Rate, Stated Percentage 2.25%  
Debt Instrument, Carrying Amount $ 1,000 0
Notes 4.875% Due 2040    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2040  
Debt Instrument, Interest Rate, Stated Percentage 4.875%  
Debt Instrument, Carrying Amount $ 600 0
Notes 4.700% Due 2041    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2041  
Debt Instrument, Interest Rate, Stated Percentage 4.70%  
Debt Instrument, Carrying Amount $ 425 0
Notes 4.200% Due 2044    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2044  
Debt Instrument, Interest Rate, Stated Percentage 4.20%  
Debt Instrument, Carrying Amount $ 300 0
Notes 3.125% Due 2050 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Year Date 2050  
Debt Instrument, Interest Rate, Stated Percentage 3.125%  
Debt Instrument, Carrying Amount $ 1,000 $ 0