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Fair Value Measurements - Financial Liabilities not Measured at Fair Value (Details) - USD ($) $ in Millions	Apr. 01, 2018	Dec. 31, 2017
Financial Liabilities
Current Debt	$ 2,696	$ 3,906
Non-Current Debt
Non-Current Debt	29,837	$ 30,675
Carrying Amount
Financial Liabilities
Current Debt	2,696
Non-Current Debt
Non-Current Debt	29,837
Estimated Fair Value
Financial Liabilities
Current Debt	2,696
Non-Current Debt
Non-Current Debt	$ 30,897
4.75% Notes due 2019 (1B Euro 1.2323)
Non-Current Debt
Stated interest rate (as a percent)	4.75%
4.75% Notes due 2019 (1B Euro 1.2323) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,230
4.75% Notes due 2019 (1B Euro 1.2323) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,330
1.875% Notes due 2019
Non-Current Debt
Stated interest rate (as a percent)	1.875%
1.875% Notes due 2019 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 495
1.875% Notes due 2019 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 492
3% Zero Coupon Convertible Subordinated Debentures due in 2020
Non-Current Debt
Stated interest rate (as a percent)	3.00%
3% Zero Coupon Convertible Subordinated Debentures due in 2020 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 52
3% Zero Coupon Convertible Subordinated Debentures due in 2020 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 92
1.950% Notes due 2020
Non-Current Debt
Stated interest rate (as a percent)	1.95%
1.950% Notes due 2020 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 499
1.950% Notes due 2020 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 492
2.95% Debentures due 2020
Non-Current Debt
Stated interest rate (as a percent)	2.95%
2.95% Debentures due 2020 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 547
2.95% Debentures due 2020 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 553
3.55% Notes due 2021
Non-Current Debt
Stated interest rate (as a percent)	3.55%
3.55% Notes due 2021 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 448
3.55% Notes due 2021 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 461
2.45% Notes due 2021
Non-Current Debt
Stated interest rate (as a percent)	2.45%
2.45% Notes due 2021 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 349
2.45% Notes due 2021 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 347
1.65% Notes due 2021
Non-Current Debt
Stated interest rate (as a percent)	1.65%
1.65% Notes due 2021 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 998
1.65% Notes due 2021 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 973
0.250% Notes due 2022 (1B Euro 1.2323)
Non-Current Debt
Stated interest rate (as a percent)	0.25%
0.250% Notes due 2022 (1B Euro 1.2323) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,229
0.250% Notes due 2022 (1B Euro 1.2323) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,236
2.25% Notes due 2022
Non-Current Debt
Stated interest rate (as a percent)	2.25%
2.25% Notes due 2022 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 995
2.25% Notes due 2022 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 975
6.73% Debentures due 2023
Non-Current Debt
Stated interest rate (as a percent)	6.73%
6.73% Debentures due 2023 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 250
6.73% Debentures due 2023 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 298
3.375% Notes due 2023
Non-Current Debt
Stated interest rate (as a percent)	3.375%
3.375% Notes due 2023 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 806
3.375% Notes due 2023 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 827
2.05% Notes due 2023
Non-Current Debt
Stated interest rate (as a percent)	2.05%
2.05% Notes due 2023 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 498
2.05% Notes due 2023 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 478
0.650% Notes due 2024 (750MM Euro 1.2323)
Non-Current Debt
Stated interest rate (as a percent)	0.65%
0.650% Notes due 2024 (750MM Euro 1.2323) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 920
0.650% Notes due 2024 (750MM Euro 1.2323) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 926
5.50% Notes due 2024 (500 MM GBP 1.4063)
Non-Current Debt
Stated interest rate (as a percent)	5.50%
5.50% Notes due 2024 (500 MM GBP 1.4063) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 697
5.50% Notes due 2024 (500 MM GBP 1.4063) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 865
2.625% Notes due 2025
Non-Current Debt
Stated interest rate (as a percent)	2.625%
2.625% Notes due 2025 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 747
2.625% Notes due 2025 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 722
2.45% Notes due 2026
Non-Current Debt
Stated interest rate (as a percent)	2.45%
2.45% Notes due 2026 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,991
2.45% Notes due 2026 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,877
2.95% Notes due 2027
Non-Current Debt
Stated interest rate (as a percent)	2.95%
2.95% Notes due 2027 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 995
2.95% Notes due 2027 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 968
2.90% Notes due 2028
Non-Current Debt
Stated interest rate (as a percent)	2.90%
2.90% Notes due 2028 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,492
2.90% Notes due 2028 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,443
1.150% Notes due 2028 (750MM Euro 1.2323)
Non-Current Debt
Stated interest rate (as a percent)	1.15%
1.150% Notes due 2028 (750MM Euro 1.2323) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 916
1.150% Notes due 2028 (750MM Euro 1.2323) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 923
6.95% Notes due 2029
Non-Current Debt
Stated interest rate (as a percent)	6.95%
6.95% Notes due 2029 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 296
6.95% Notes due 2029 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 397
4.95% Debentures due 2033
Non-Current Debt
Stated interest rate (as a percent)	4.95%
4.95% Debentures due 2033 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 498
4.95% Debentures due 2033 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 580
4.375% Notes due 2033
Non-Current Debt
Stated interest rate (as a percent)	4.375%
4.375% Notes due 2033 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 856
4.375% Notes due 2033 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 938
1.650% Notes due 2035 (1.5B Euro 1.2323)
Non-Current Debt
Stated interest rate (as a percent)	1.65%
1.650% Notes due 2035 (1.5B Euro 1.2323) | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,830
1.650% Notes due 2035 (1.5B Euro 1.2323) | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,907
3.55% Notes due 2036
Non-Current Debt
Stated interest rate (as a percent)	3.55%
3.55% Notes due 2036 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 987
3.55% Notes due 2036 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 978
5.95% Notes due 2037
Non-Current Debt
Stated interest rate (as a percent)	5.95%
5.95% Notes due 2037 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 991
5.95% Notes due 2037 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,289
3.625% Notes due 2037
Non-Current Debt
Stated interest rate (as a percent)	3.625%
3.625% Notes due 2037 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,486
3.625% Notes due 2037 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,479
3.40% Notes due 2038
Non-Current Debt
Stated interest rate (as a percent)	3.40%
3.40% Notes due 2038 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 990
3.40% Notes due 2038 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 961
5.85% Debentures due 2038
Non-Current Debt
Stated interest rate (as a percent)	5.85%
5.85% Debentures due 2038 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 696
5.85% Debentures due 2038 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 908
4.50% Debentures due 2040
Non-Current Debt
Stated interest rate (as a percent)	4.50%
4.50% Debentures due 2040 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 538
4.50% Debentures due 2040 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 604
4.85% Notes due 2041
Non-Current Debt
Stated interest rate (as a percent)	4.85%
4.85% Notes due 2041 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 296
4.85% Notes due 2041 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 340
4.50% Notes due 2043
Non-Current Debt
Stated interest rate (as a percent)	4.50%
4.50% Notes due 2043 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 495
4.50% Notes due 2043 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 545
3.70% Notes due 2046
Non-Current Debt
Stated interest rate (as a percent)	3.70%
3.70% Notes due 2046 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 1,971
3.70% Notes due 2046 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 1,966
3.75% Notes due 2047
Non-Current Debt
Stated interest rate (as a percent)	3.75%
3.75% Notes due 2047 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 991
3.75% Notes due 2047 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 991
3.50% Notes due 2048
Non-Current Debt
Stated interest rate (as a percent)	3.50%
3.50% Notes due 2048 | Carrying Amount
Non-Current Debt
Non-Current Debt	$ 742
3.50% Notes due 2048 | Estimated Fair Value
Non-Current Debt
Non-Current Debt	716
Other | Carrying Amount
Non-Current Debt
Non-Current Debt	20
Other | Estimated Fair Value
Non-Current Debt
Non-Current Debt	$ 20

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+ References

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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