Debt - Additional Information (Detail) | May 05, 2020USD ($) | May 04, 2020USD ($) | Jun. 30, 2020USD ($) | Jul. 14, 2020USD ($) | Jun. 30, 2020EUR (€) | Mar. 18, 2020USD ($) | Dec. 31, 2019USD ($) | Dec. 31, 2019EUR (€) |
Revolving Credit Facility | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Credit facility | | | $ 2,000,000,000 | | | $ 1,900,000,000 | | |
Credit facility borrowings outstanding | | | 1,900,000,000 | | | | $ 0 | |
Letters of credit issued under the credit facility | | | 16,000,000 | | | | 16,000,000 | |
Uncommitted Credit Facility | International Subsidiary One | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Credit facility | € | | | | | € 50,000,000 | | | |
Credit facility borrowings outstanding | | | | | € 0 | | 0 | € 0 |
Senior Notes | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Accrued interest related to senior notes | | | 98,000,000 | | | | $ 76,000,000 | |
Unsecured Senior Notes | Subsequent Event | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | | | | $ 1,250,000,000 | | | | |
5.95% senior notes due 2020 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | | | $ 750,000,000 | | | | | |
Debt, interest rate (percentage) | | | 5.95% | | 5.95% | | | |
Senior notes issued price percentage | | | 99.893% | | 99.893% | | | |
Debt instrument redemption price percentage | | | 100.00% | | | | | |
5.95% senior notes due 2020 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
2.5% (€650 million) senior notes due 2022 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | € | | | | | € 650,000,000 | | | |
Debt, interest rate (percentage) | | | 2.50% | | 2.50% | | | |
Senior notes issued price percentage | | | 99.525% | | 99.525% | | | |
Debt instrument redemption price percentage | | | 100.00% | | | | | |
2.5% (€650 million) senior notes due 2022 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
4.5% senior notes due 2024 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | | | $ 500,000,000 | | | | | |
Debt, interest rate (percentage) | | | 4.50% | | 4.50% | | | |
Senior notes issued price percentage | | | 99.444% | | 99.444% | | | |
Debt instrument redemption price percentage | | | 100.00% | | | | | |
4.5% senior notes due 2024 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
5.0% senior notes due 2026 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | | | $ 750,000,000 | | | | | |
Debt, interest rate (percentage) | | | 5.00% | | 5.00% | | | |
Senior notes issued price percentage | | | 99.535% | | 99.535% | | | |
Debt instrument redemption price percentage | | | 100.00% | | | | | |
5.0% senior notes due 2026 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
3.8% senior notes due 2028 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | | | $ 1,000,000,000 | | | | | |
Debt, interest rate (percentage) | | | 3.80% | | 3.80% | | | |
Senior notes issued price percentage | | | 99.747% | | 99.747% | | | |
Debt instrument redemption price percentage | | | 100.00% | | | | | |
3.8% senior notes due 2028 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
3.25% senior notes due 2030 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | | | $ 1,250,000,000 | | | | | |
Debt, interest rate (percentage) | | | 3.25% | | 3.25% | | | |
Senior notes issued price percentage | | | 99.225% | | 99.225% | | | |
3.25% senior notes due 2030 | Notes prior to November 15, 2029 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 100.00% | | | | | |
3.25% senior notes due 2030 | Notes on or after November 15, 2029 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 100.00% | | | | | |
3.25% senior notes due 2030 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
6.25% senior notes due 2025 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | | 6.25% | | 6.25% | | | |
6.25% senior notes due 2025 | Unsecured Senior Notes | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | $ 2,000,000,000 | | | | | | | |
Debt, interest rate (percentage) | 6.25% | | | | | | | |
Debt instrument redemption price percentage | 100.00% | | | | | | | |
6.25% senior notes due 2025 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
7.0% senior notes due 2025 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | | 7.00% | | 7.00% | | | |
7.0% senior notes due 2025 | Unsecured Senior Notes | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Senior unsecured notes principal amount | $ 750,000,000 | | | | | | | |
Debt, interest rate (percentage) | 7.00% | | | | | | | |
Debt instrument redemption price percentage | 100.00% | | | | | | | |
7.0% senior notes due 2025 | Unsecured Senior Notes | Maximum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Percentage of principal amount redeemed | 40.00% | | | | | | | |
7.0% senior notes due 2025 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument redemption price percentage | | | 101.00% | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | | 2.55% | | 2.55% | | | |
Credit facility | | | $ 2,000,000,000 | | | | | |
Credit facility borrowings outstanding | | | $ 1,900,000,000 | | | | | |
Commitment fee on undrawn amounts | | 2.25% | | | | | | |
Additional credit facility, excess amount | | $ 1,145,000,000 | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Minimum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 0.10% | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Maximum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 0.85% | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Notes prior to November 15, 2029 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Commitment fee on undrawn amounts | | 1.25% | | | | | | |
Additional credit facility, excess amount | | $ 1,145,000,000 | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Notes prior to November 15, 2029 | Minimum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 1.00% | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Notes prior to November 15, 2029 | Maximum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 1.75% | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Notes on or after November 15, 2029 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Additional credit facility, excess amount | | $ 1,145,000,000 | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Notes on or after November 15, 2029 | Minimum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 0.00% | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Notes on or after November 15, 2029 | Maximum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 0.75% | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Upon the occurrence of certain change of control triggering events | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt instrument, covenant, leverage ratio, maximum | | 5 | | | | | | |
Additional credit facility, excess amount | | $ 1,145,000,000 | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Upon the occurrence of certain change of control triggering events | Minimum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 1.10% | | | | | | |
Amended Credit Facility Maturing on May 31, 2023 | Upon the occurrence of certain change of control triggering events | Maximum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 1.85% | | | | | | |
Additional Credit Facility | Maximum | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Additional borrowing capacity | $ 855,000,000 | | | | | | | |
Eurodollar | Amended Credit Facility Maturing on May 31, 2023 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 2.35% | | | | | | |
Base Rate | Amended Credit Facility Maturing on May 31, 2023 | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | |
Debt, interest rate (percentage) | | 1.35% | | | | | | |