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Indebtedness - Fair Value and Carrying Value of Long-Term Debt (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 25, 2020
Mar. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Carrying Amount   $ 6,303 $ 6,303 $ 5,581
Estimated Fair Value   6,584 6,584 6,078
4.50% 2012 Senior Notes, due 2022        
Debt Instrument [Line Items]        
Carrying Amount   516 516 507
Estimated Fair Value   $ 521 $ 521 $ 531
Notes payable, interest rate   4.50% 4.50% 4.50%
4.875% 2013 Senior Notes, due 2024        
Debt Instrument [Line Items]        
Carrying Amount   $ 498 $ 498 $ 497
Estimated Fair Value   $ 536 $ 536 $ 551
Notes payable, interest rate   4.875% 4.875% 4.875%
5.25% 2014 Senior Notes (30-Year), due 2044        
Debt Instrument [Line Items]        
Carrying Amount   $ 598 $ 598 $ 599
Estimated Fair Value   $ 738 $ 738 $ 757
Notes payable, interest rate   5.25% 5.25% 5.25%
Debt instrument, term     30 years 30 years
1.75% 2015 Senior Notes, due 2027        
Debt Instrument [Line Items]        
Carrying Amount   $ 546 $ 546 $ 558
Estimated Fair Value   $ 577 $ 577 $ 604
Notes payable, interest rate   1.75% 1.75% 1.75%
2.75% 2017 Senior Notes, due 2021        
Debt Instrument [Line Items]        
Carrying Amount   $ 520 $ 520 $ 508
Estimated Fair Value   $ 497 $ 497 $ 507
Notes payable, interest rate   2.75% 2.75% 2.75%
2.625% 2017 Senior Notes, due 2023        
Debt Instrument [Line Items]        
Carrying Amount   $ 512 $ 512 $ 504
Estimated Fair Value   $ 496 $ 496 $ 507
Notes payable, interest rate   2.625% 2.625% 2.625%
3.25% 2017 Senior Notes, due 2028        
Debt Instrument [Line Items]        
Carrying Amount   $ 524 $ 524 $ 493
Estimated Fair Value   $ 509 $ 509 $ 523
Notes payable, interest rate   3.25% 3.25% 3.25%
3.25% 2018 Senior Notes, due 2021        
Debt Instrument [Line Items]        
Carrying Amount   $ 299 $ 299 $ 299
Estimated Fair Value   $ 301 $ 301 $ 306
Notes payable, interest rate   3.25% 3.25% 3.25%
4.25% 2018 Senior Notes, due 2029        
Debt Instrument [Line Items]        
Carrying Amount   $ 394 $ 394 $ 394
Estimated Fair Value   $ 445 $ 445 $ 453
Notes payable, interest rate   4.25% 4.25% 4.25%
4.875% 2018 Senior Notes, due 2048        
Debt Instrument [Line Items]        
Carrying Amount   $ 389 $ 389 $ 389
Estimated Fair Value   $ 463 $ 463 $ 492
Notes payable, interest rate   4.875% 4.875% 4.875%
0.950% Senior Notes Due 2030        
Debt Instrument [Line Items]        
Carrying Amount   $ 814 $ 814 $ 833
Estimated Fair Value   $ 769 $ 769 $ 847
Notes payable, interest rate   0.95% 0.95% 0.95%
3.75% 2020 Senior Note, due 2025        
Debt Instrument [Line Items]        
Carrying Amount   $ 693 $ 693  
Estimated Fair Value   $ 732 $ 732  
Notes payable, interest rate 3.75% 3.75% 3.75%  
Debt instrument, term 5 years 5 years