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Borrowings and Credit Arrangements - Schedule of Debt (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2018
Dec. 31, 2019
Aug. 31, 2019
Aug. 15, 2019
Jan. 01, 2019
Debt Instrument [Line Items]            
Short-term debt   $ 720 $ 0      
Long-term debt     68,438      
Finance lease liabilities     808      
Finance lease liabilities   642        
Total debt principal   74,265 69,246      
Debt premiums   302 262      
Debt discounts and deferred financing costs   (1,138) (1,028)      
Long-term debt, short term debt, and lease obligation   73,429 68,480      
Short-term debt (commercial paper)   (720) 0      
Current portion of long-term debt   (1,265) (3,781)     $ (1,267)
Long-term debt   $ 71,444 64,699      
Senior Notes | 2.2% senior notes due March 2019            
Debt Instrument [Line Items]            
Debt interest rate   2.20%        
Long-term debt   $ 375 0      
Senior Notes | 2.25% senior notes due August 2019            
Debt Instrument [Line Items]            
Debt interest rate   2.25%        
Long-term debt   $ 850 $ 0      
Senior Notes | 3.125% senior notes due March 2020            
Debt Instrument [Line Items]            
Debt interest rate     3.125% 3.125%    
Long-term debt   2,000 $ 723      
Senior Notes | 2.8% senior notes due July 2020            
Debt Instrument [Line Items]            
Debt interest rate     2.80%      
Long-term debt   2,750 $ 2,750      
Senior Notes | 3.35% senior notes due March 2021            
Debt Instrument [Line Items]            
Debt interest rate     3.35% 3.35%    
Long-term debt   3,000 $ 2,038      
Senior Notes | 4.125% senior notes due May 2021            
Debt Instrument [Line Items]            
Debt interest rate     4.125%      
Long-term debt   550 $ 222      
Senior Notes | 2.125% senior notes due June 2021            
Debt Instrument [Line Items]            
Debt interest rate     2.125%      
Long-term debt   1,750 $ 1,750      
Senior Notes | 4.125% senior notes due June 2021            
Debt Instrument [Line Items]            
Debt interest rate     4.125%      
Long-term debt   500 $ 203      
Senior Notes | 5.45% senior notes due June 2021            
Debt Instrument [Line Items]            
Debt interest rate     5.45% 5.45%    
Long-term debt   600 $ 187      
Senior Notes | 3.5% senior notes due July 2022            
Debt Instrument [Line Items]            
Debt interest rate     3.50%      
Long-term debt   1,500 $ 1,500      
Senior Notes | 2.75% senior notes due November 2022            
Debt Instrument [Line Items]            
Debt interest rate     2.75%      
Long-term debt   1,000 $ 1,000      
Senior Notes | 2.75% senior notes due December 2022            
Debt Instrument [Line Items]            
Debt interest rate     2.75%      
Long-term debt   1,250 $ 1,250      
Senior Notes | 4.75% senior notes due December 2022            
Debt Instrument [Line Items]            
Debt interest rate     4.75%      
Long-term debt   399 $ 399      
Senior Notes | 3.7% senior notes due March 2023            
Debt Instrument [Line Items]            
Debt interest rate     3.70%      
Long-term debt   6,000 $ 6,000      
Senior Notes | 2.8% senior notes due June 2023            
Debt Instrument [Line Items]            
Debt interest rate     2.80%      
Long-term debt   1,300 $ 1,300      
Senior Notes | 4% senior notes due December 2023            
Debt Instrument [Line Items]            
Debt interest rate     4.00%      
Long-term debt   1,250 $ 1,250      
Senior Notes | 2.625% senior notes due August 2024            
Debt Instrument [Line Items]            
Debt interest rate     2.265%   2.625%  
Long-term debt   0 $ 1,000      
Senior Notes | 3.375% senior notes due August 2024            
Debt Instrument [Line Items]            
Debt interest rate     3.375%      
Long-term debt   650 $ 650      
Senior Notes | 3.5% senior notes due November 2024            
Debt Instrument [Line Items]            
Debt interest rate     3.50%      
Long-term debt   750 $ 750      
Senior Notes | 5% senior notes due December 2024            
Debt Instrument [Line Items]            
Debt interest rate     5.00%      
Long-term debt   299 $ 299      
Senior Notes | 4.1% senior notes due March 2025            
Debt Instrument [Line Items]            
Debt interest rate     4.10%      
Long-term debt   5,000 $ 5,000      
Senior Notes | 3.875% senior notes due July 2025            
Debt Instrument [Line Items]            
Debt interest rate     3.875%      
Long-term debt   2,828 $ 2,828      
Senior Notes | 2.875% senior notes due June 2026            
Debt Instrument [Line Items]            
Debt interest rate     2.875%      
Long-term debt   1,750 $ 1,750      
Senior Notes | 3% senior notes due August 2026            
Debt Instrument [Line Items]            
Debt interest rate     3.00%   3.00%  
Long-term debt   0 $ 750      
Senior Notes | 6.25% senior notes due June 2027            
Debt Instrument [Line Items]            
Debt interest rate     6.25%      
Long-term debt   372 $ 372      
Senior Notes | 4.3% senior notes due March 2028            
Debt Instrument [Line Items]            
Debt interest rate     4.30%      
Long-term debt   9,000 $ 9,000      
Senior Notes | 3.25% senior notes due August 2029            
Debt Instrument [Line Items]            
Debt interest rate     3.25%   3.25%  
Long-term debt   0 $ 1,750      
Senior Notes | 4.875% senior notes due July 2035            
Debt Instrument [Line Items]            
Debt interest rate     4.875%      
Long-term debt   652 $ 652      
Senior Notes | 6.625% senior notes due June 2036            
Debt Instrument [Line Items]            
Debt interest rate     6.625%      
Long-term debt   771 $ 771      
Senior Notes | 6.75% senior notes due December 2037            
Debt Instrument [Line Items]            
Debt interest rate     6.75%      
Long-term debt   533 $ 533      
Senior Notes | 4.78% senior notes due March 2038            
Debt Instrument [Line Items]            
Debt interest rate     4.78%      
Long-term debt   5,000 $ 5,000      
Senior Notes | 6.125% senior notes due September 2039            
Debt Instrument [Line Items]            
Debt interest rate     6.125%      
Long-term debt   447 $ 447      
Senior Notes | 5.75% senior notes due May 2041            
Debt Instrument [Line Items]            
Debt interest rate     5.75%      
Long-term debt   133 $ 133      
Senior Notes | 4.5% senior notes due May 2042            
Debt Instrument [Line Items]            
Debt interest rate     4.50%      
Long-term debt   500 $ 500      
Senior Notes | 4.125% senior notes due November 2042            
Debt Instrument [Line Items]            
Debt interest rate     4.125%      
Long-term debt   500 $ 500      
Senior Notes | 5.3% senior notes due December 2043            
Debt Instrument [Line Items]            
Debt interest rate     5.30%      
Long-term debt   750 $ 750      
Senior Notes | 4.75% senior notes due March 2044            
Debt Instrument [Line Items]            
Debt interest rate     4.75%      
Long-term debt   375 $ 375      
Senior Notes | 5.125% senior notes due July 2045            
Debt Instrument [Line Items]            
Debt interest rate     5.125%      
Long-term debt   3,500 $ 3,500      
Senior Notes | 3.875% senior notes due August 2047            
Debt Instrument [Line Items]            
Debt interest rate     3.875%      
Long-term debt   1,000 $ 1,000      
Senior Notes | 5.05% senior notes due March 2048            
Debt Instrument [Line Items]            
Debt interest rate     5.05%      
Long-term debt   $ 8,000 $ 8,000      
Notes Payable | Floating rate notes due March 2020            
Debt Instrument [Line Items]            
Debt interest rate   3.397% 2.515%      
Long-term debt   $ 1,000 $ 277      
Notes Payable | Floating rate notes due March 2021            
Debt Instrument [Line Items]            
Debt interest rate   3.487% 2.605%      
Long-term debt   $ 1,000 $ 1,000      
Notes Payable | 3-year tranche term loan due November 2021            
Debt Instrument [Line Items]            
Debt instrument term 3 years 3 years        
Long-term debt   $ 3,000 0      
Other Debt Obligations            
Debt Instrument [Line Items]            
Long-term debt   $ 19 $ 279