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Debt Obligations (Changes in Debt Obligations) (Details) - USD ($) | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Apr. 30, 2017 | Jun. 30, 2016 | May 31, 2016 | May 31, 2014 | Jun. 30, 2013 | Jan. 31, 2010
Changes In Short-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Short-term debt - commercial paper beginning balance | $ 978,000,000 |  |  |  |  |  |
Additions | 3,192,000,000 |  |  |  |  |  |
Payments, Accretion and Other | (3,362,000,000) |  |  |  |  |  |
Short-term debt - commercial paper ending balance | 808,000,000 |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | 3,229,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | (157,000,000) |  |  |  |  |  |
Long-term debt obligations at end of period | 3,072,000,000 |  |  |  |  |  |
Changes In Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Total debt obligations at beginning of period | 4,207,000,000 |  |  |  |  |  |
Additions | 3,192,000,000 |  |  |  |  |  |
Payments, Accretion and Other | (3,519,000,000) |  |  |  |  |  |
Total debt obligations at end of period | 3,880,000,000 |  |  |  |  |  |
$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 3.37% for the period January 1, 2018 through September 30, 2018) |  |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | 100,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | 0 |  |  |  |  |  |
Long-term debt obligations at end of period | 100,000,000 |  |  |  |  |  |
Credit facility, borrowing capacity | $ 400,000,000 |  |  |  |  |  |
Interest rate during period | 3.37% |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |
Changes In Short-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Short-term debt - commercial paper beginning balance | $ 480,000,000 |  |  |  |  |  |
Additions | 3,192,000,000 |  |  |  |  |  |
Payments, Accretion and Other | (3,363,000,000) |  |  |  |  |  |
Short-term debt - commercial paper ending balance | 309,000,000 |  |  |  |  |  |
Senior unsecured floating rate notes due March 22, 2019 |  |  |  |  |  |  |
Changes In Short-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Short-term debt - commercial paper beginning balance | 498,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | 1,000,000 |  |  |  |  |  |
Short-term debt - commercial paper ending balance | 499,000,000 |  |  |  |  |  |
Senior Notes | 5.55% senior unsecured notes due January 15, 2020 |  |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | 599,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | 0 |  |  |  |  |  |
Long-term debt obligations at end of period | $ 599,000,000 |  |  |  |  |  |
Stated rate | 5.55% |  |  |  |  |  | 5.55%
Senior Notes | 3.875% senior unsecured notes due June 7, 2021 |  |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | $ 716,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | (22,000,000) |  |  |  |  |  |
Long-term debt obligations at end of period | $ 694,000,000 |  |  |  |  |  |
Stated rate | 3.875% |  |  |  |  | 3.875% |
Senior Notes | 4.25% senior unsecured notes due June 1, 2024 |  |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | $ 496,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | 1,000,000 |  |  |  |  |  |
Long-term debt obligations at end of period | $ 497,000,000 |  |  |  |  |  |
Stated rate | 4.25% |  |  |  | 4.25% |  |
Senior Notes | 1.75% senior unsecured notes due May 19, 2023 |  |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | $ 712,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | (22,000,000) |  |  |  |  |  |
Long-term debt obligations at end of period | $ 690,000,000 |  |  |  |  |  |
Stated rate | 1.75% |  |  | 1.75% |  |  |
Senior Notes | 3.85% senior unsecured notes due June 30, 2026 |  |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | $ 496,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | 0 |  |  |  |  |  |
Long-term debt obligations at end of period | $ 496,000,000 |  |  |  |  |  |
Stated rate | 3.85% |  | 3.85% |  |  |  |
Revolving Credit Facility | $1 billion revolving credit commitment due April 25, 2022 (average interest rate of 2.74% for the period January 1, 2018 through September 30, 2018) |  |  |  |  |  |  |
Changes in Long-Term Debt Obligations [Roll Forward] |  |  |  |  |  |  |
Long-term debt obligations at beginning of period | $ 110,000,000 |  |  |  |  |  |
Additions | 0 |  |  |  |  |  |
Payments, Accretion and Other | (114,000,000) |  |  |  |  |  |
Long-term debt obligations at end of period | (4,000,000) |  |  |  |  |  |
Credit facility, borrowing capacity | $ 1,000,000,000 | $ 1,000,000,000 |  |  |  |  |
Interest rate during period | 2.74% |  |  |  |  |  |

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