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Debt - Summary of Long-term Debt (Details)
$ in Millions
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
USD ($)
Feb. 28, 2021
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Principal amount at par   $ 15,662     $ 16,416
Fair value   18,222     18,805
Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par | € € 5,170,000,000        
Senior Notes | 5.375% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   0     500
Fair value   $ 0     $ 502
Interest rate 5.375% 5.375% 5.375% 5.375% 5.375%
Senior Notes | 5.500% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 700     $ 700
Fair value   $ 729     $ 735
Interest rate 5.50% 5.50%   5.50% 5.50%
Senior Notes | 5.750% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 400     $ 400
Fair value   $ 449     $ 449
Interest rate 5.75% 5.75%   5.75% 5.75%
Senior Notes | 5.875% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 800     $ 800
Fair value   $ 917     $ 921
Interest rate 5.875% 5.875%   5.875% 5.875%
Senior Notes | 3.000% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par € 470,000,000 $ 551   € 470,000,000 $ 574
Fair value   $ 600     $ 616
Interest rate 3.00% 3.00%   3.00% 3.00%
Senior Notes | 3.625% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 500     $ 500
Fair value   $ 534     $ 535
Interest rate 3.625% 3.625%   3.625% 3.625%
Senior Notes | 4.375% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 1,000     $ 1,000
Fair value   $ 1,119     $ 1,110
Interest rate 4.375% 4.375%   4.375% 4.375%
Senior Notes | 3.625% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par € 1,300,000,000 $ 1,524   € 1,300,000,000 $ 1,588
Fair value   $ 1,748     $ 1,776
Interest rate 3.625% 3.625%   3.625% 3.625%
Senior Notes | 4.875% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 1,600     $ 1,600
Fair value   $ 1,812     $ 1,807
Interest rate 4.875% 4.875%   4.875% 4.875%
Senior Notes | 5.875% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 1,900     $ 1,900
Fair value   $ 2,302     $ 2,280
Interest rate 5.875% 5.875%   5.875% 5.875%
Senior Notes | 4.625% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par € 1,100,000,000 $ 1,290   € 1,100,000,000 $ 1,344
Fair value   $ 1,605     $ 1,630
Interest rate 4.625% 4.625%   4.625% 4.625%
Senior Notes | 6.375% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 800     $ 800
Fair value   $ 997     $ 995
Interest rate 6.375% 6.375%   6.375% 6.375%
Senior Notes | 3.875% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par € 1,200,000,000 $ 1,407   € 1,200,000,000 $ 1,466
Fair value   $ 1,680     $ 1,700
Interest rate 3.875% 3.875%   3.875% 3.875%
Senior Notes | 5.375% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 900     $ 900
Fair value   $ 1,065     $ 1,061
Interest rate 5.375% 5.375%   5.375% 5.375%
Senior Notes | 3.625% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par € 1,100,000,000 $ 1,290   € 1,100,000,000 $ 1,344
Fair value   $ 1,513     $ 1,533
Interest rate 3.625% 3.625%   3.625% 3.625%
Senior Notes | 4.875% Senior Notes          
Debt Instrument [Line Items]          
Principal amount at par   $ 1,000     $ 1,000
Fair value   $ 1,152     $ 1,155
Interest rate 4.875% 4.875%   4.875% 4.875%