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Debt Fixed-rate Notes and Other (Details 1)
£ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 01, 2020
USD ($)
Dec. 01, 2020
GBP (£)
Mar. 23, 2020
Rate
Dec. 31, 2019
USD ($)
Long-Term Debt (Table Amounts) [Abstract]          
Long-term debt $ 15,003        
Other long-term debt 235       $ 272
Debt issuance costs (75)       (64)
Total long-term debt 15,003       13,879
Less: current portion 742       1,109
Long-term Debt and Lease Obligation $ 14,261       12,770
2020          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 2.08%        
Long-term debt $ 0       1,000
2021          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 3.50%        
Long-term debt $ 700       700
2022          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 2.55%        
Long-term debt $ 1,500       1,500
2023          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 3.25%        
Long-term debt $ 1,050       1,050
2025          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 2.93%        
Long-term debt $ 1,500       1,500
2026          
Long-Term Debt (Table Amounts) [Abstract]          
Long-term debt $ 527       527
2027          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 3.20%        
Long-term debt $ 750       750
2028          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 3.25%        
Long-term debt $ 2,000       2,000
2031          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 7.75%        
Long-term debt $ 466       466
2040          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage | Rate       5.15%  
Long-term debt $ 800       300
2043          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 4.75%        
Long-term debt $ 950       950
2045          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 3.85%        
Long-term debt $ 600       600
2047          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 4.03%        
Long-term debt $ 2,250       2,250
Two Year Term [Member] [Domain]          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 1.89%        
Credit facilities $ 0 $ 68 £ 50   78
Two Thousand Fifty          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 5.25%     5.25%  
Long-term debt $ 1,000       0
Two Thousand Thirty          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 4.40%     4.40%  
Long-term debt $ 750       $ 0
Minimum | 2026          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 7.75%        
Minimum | 2040          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 5.05%        
Maximum | 2026          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 7.88%        
Maximum | 2040          
Long-Term Debt (Table Amounts) [Abstract]          
Debt Instrument, Interest Rate, Stated Percentage 5.15%