Debt - Summary of Long-term Debt (Details) $ in Millions	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Face amount		$ 16,416		$ 14,873
Long-term debt, fair value		18,805		15,949
Senior Notes
Debt Instrument [Line Items]
Face amount | €	€ 5,170,000,000
Senior Notes | 5.375% Senior Notes
Debt Instrument [Line Items]
Face amount		500		500
Long-term debt, fair value		$ 502		$ 518
Interest rate	5.375%	5.375%	5.375%	5.375%
Senior Notes | 5.500% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 700		$ 700
Long-term debt, fair value		$ 735		$ 744
Interest rate	5.50%	5.50%	5.50%	5.50%
Senior Notes | 5.750% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 400		$ 400
Long-term debt, fair value		$ 449		$ 444
Interest rate	5.75%	5.75%	5.75%	5.75%
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 800		$ 800
Long-term debt, fair value		$ 921		$ 896
Interest rate	5.875%	5.875%	5.875%	5.875%
Senior Notes | 3.000% Senior Notes
Debt Instrument [Line Items]
Face amount	€ 470,000,000	$ 574	€ 470,000,000	$ 0
Long-term debt, fair value		$ 616		$ 0
Interest rate	3.00%	3.00%	3.00%	3.00%
Senior Notes | 3.625% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 500		$ 0
Long-term debt, fair value		$ 535		$ 0
Interest rate	3.625%	3.625%	3.625%	3.625%
Senior Notes | 4.375% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 1,000		$ 1,000
Long-term debt, fair value		$ 1,110		$ 1,026
Interest rate	4.375%	4.375%	4.375%	4.375%
Senior Notes | 3.625% Senior Notes
Debt Instrument [Line Items]
Face amount	€ 1,300,000,000	$ 1,588	€ 1,300,000,000	$ 1,459
Long-term debt, fair value		$ 1,776		$ 1,565
Interest rate	3.625%	3.625%	3.625%	3.625%
Senior Notes | 4.875% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 1,600		$ 1,600
Long-term debt, fair value		$ 1,807		$ 1,670
Interest rate	4.875%	4.875%	4.875%	4.875%
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 1,900		$ 1,900
Long-term debt, fair value		$ 2,280		$ 2,111
Interest rate	5.875%	5.875%	5.875%	5.875%
Senior Notes | 4.625% Senior Notes
Debt Instrument [Line Items]
Face amount	€ 1,100,000,000	$ 1,344	€ 1,100,000,000	$ 1,234
Long-term debt, fair value		$ 1,630		$ 1,378
Interest rate	4.625%	4.625%	4.625%	4.625%
Senior Notes | 6.375% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 800		$ 800
Long-term debt, fair value		$ 995		$ 916
Interest rate	6.375%	6.375%	6.375%	6.375%
Senior Notes | 3.875% Senior Notes
Debt Instrument [Line Items]
Face amount	€ 1,200,000,000	$ 1,466	€ 1,200,000,000	$ 1,346
Long-term debt, fair value		$ 1,700		$ 1,429
Interest rate	3.875%	3.875%	3.875%	3.875%
Senior Notes | 5.375% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 900		$ 900
Long-term debt, fair value		$ 1,061		$ 960
Interest rate	5.375%	5.375%	5.375%	5.375%
Senior Notes | 3.625% Senior Notes
Debt Instrument [Line Items]
Face amount	€ 1,100,000,000	$ 1,344	€ 1,100,000,000	$ 1,234
Long-term debt, fair value		$ 1,533		$ 1,273
Interest rate	3.625%	3.625%	3.625%	3.625%
Senior Notes | 4.875% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 1,000		$ 1,000
Long-term debt, fair value		$ 1,155		$ 1,019
Interest rate	4.875%	4.875%	4.875%	4.875%