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Debt - Short-term Debt (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 28, 2018 | Oct. 26, 2018 | Jan. 03, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 09, 2018 | Dec. 15, 2017 | Dec. 03, 2017
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 720,000,000 | $ 1,276,000,000 |  |  |
Debt face amount | $ 2,000,000,000.0 |  |  |  |  |  |  |
Federal home loan bank advances maximum amount available |  |  |  | 790,000,000 |  |  |  |
2018 Senior Notes |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 40,000,000,000 |  |
Notes Payable | 3-Year and 5-Year Term Loan |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 5,000,000,000 |
Debt face amount | 5,000,000,000.0 |  |  |  |  |  |  |
Senior Notes | 2018 Senior Notes |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | 40,000,000,000 |  |
Commercial Paper |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 720,000,000 | $ 1,300,000,000 |  |  |
Short-term debt, weighted average interest rate |  |  |  | 2.80% | 2.00% |  |  |
Line of Credit | Back-Up Credit Facilities |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 0 | $ 0 |  |  |
Commitment fee percentage |  |  |  | 0.03% |  |  |  |
Line of Credit | Revolving Credit Facility, Expiring May 16, 2019 |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,750,000,000 |  |  |  |
Debt term |  |  |  | 364 days |  |  |  |
Line of Credit | Revolving Credit Facility, Expiring July 1, 2020 |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,250,000,000 |  |  |  |
Debt term |  |  |  | 5 years |  |  |  |
Line of Credit | Revolving Credit Facility, Expiring May 18, 2022 |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,000,000,000 |  |  |  |
Debt term |  |  |  | 5 years |  |  |  |
Line of Credit | Revolving Credit Facility, Expiring May 17, 2023 |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 2,000,000,000 |  |  |  |
Debt term |  |  |  | 5 years |  |  |  |
Line of Credit | 2017 Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 2,500,000,000 |  |  |  |  |
Commitment fee percentage |  |  | 0.03% |  |  |  |  |
Bridge Loan |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Debt term |  | 364 days |  |  |  |  |  |
Debt face amount |  | $ 4,000,000,000.0 |  |  |  | 4,000,000,000 | $ 44,000,000,000 | $ 49,000,000,000
Debt issuance cost capitalized |  |  |  |  |  | $ 8,000,000 |  | $ 221,000,000
Amortization of debt issuance costs |  |  |  | $ 173,000,000 | $ 56,000,000 |  |  |
Extinguishment of debt | $ 4,000,000,000.0 |  |  |  |  |  |  |
Federal Home Loan Bank Advances |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 0 |  |  |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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- Definition Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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